Gro Harlem Brundtland, M.D., M.P.H.former Director-General, World Health Organization. Epidemiologists emphasize that the "one cause – one effect" understanding is a simplistic mis-belief. Observational studies – we do not interfere in the process of the disease, but simply observe the disease and the associated factors. Epidemiologists create complex analytical models to help us understand the causes of and solutions to these diseases more clearly. The MPH degree prepares individuals to apply epidemiologic skills in a practice setting. Centers for Disease Control and Prevention. Bhoj R Singh Division of Epidemiology … … Much like diseases of humans and other animals, plant diseases occur due to pathogens such as bacteria, viruses, fungi, oomycetes, nematodes, phytoplasmas, protozoa, and parasitic plants. The LibreTexts libraries are Powered by MindTouch ® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, … It is … [18][19] Another important pioneer was Hungarian physician Ignaz Semmelweis, who in 1847 brought down infant mortality at a Vienna hospital by instituting a disinfection procedure. A systematic error or bias occurs when there is a difference between the true value (in the population) and the observed value (in the study) from any cause other than sampling variability. Students who concentrate in epidemiology are interested in how diseases spread among given populations. Epidemiology is more about statistical analysis of distribution, looking for patterns, and working out causes of a condition. It is more about examining trends than it is about the medical aspects of a condition, although this does play a part. In the middle of the 16th century, a doctor from Verona named Girolamo Fracastoro was the first to propose a theory that these very small, unseeable, particles that cause disease were alive. This is called sampling error. Injury Epidemiology: Fourth Edition. [56], Few universities have offered epidemiology as a course of study at the undergraduate level. If a necessary condition can be identified and controlled (e.g., antibodies to a disease agent, energy in an injury), the harmful outcome can be avoided (Robertson, 2015). Snow used chlorine in an attempt to clean the water and removed the handle; this ended the outbreak. It refers to the study and analysis of the distribution (referring to the who, when and where), patterns, and determinants of health and disease conditions in certain populations. As such, mortality is often inaccurately measured using either prospective demographic surveillance or retrospective mortality surveys. Epidemiologists use scientific and systematic data to look at the frequency and pattern of these events, as well as causes and risk factors. Specifically, "genetic epidemiology" has been used for epidemiology of germline genetic variation and disease. It is … "Correlation does not imply causation" is a common theme for much of the epidemiological literature. This has as a consequence that the control group can contain people with the disease under study when the disease has a high attack rate in a population. In epidemiology, researchers are interested in measuring or assessing the relationship of exposure with a disease or an outcome. The statistic generated to measure association is the odds ratio (OR), which is the ratio of the odds of exposure in the cases (A/C) to the odds of exposure in the controls (B/D), i.e. Epidemiology is the branch of medical science that investigates all the factors that determine the presence or absence of diseases and disorders. However, in public health, the terms "field epidemiology" ( 2 ) and "applied epidemiology" ( 3 )---which emphasize use of results in public health settings---define the practice of epidemiology at CDC. UHC enables everyone to access the services that address the most significant causes of disease and death, and ensures that the quality of those services is good enough to improve the health of the people who receive them. The Greek physician Hippocrates, known as the father of medicine,[5][6] sought a logic to sickness; he is the first person known to have examined the relationships between the occurrence of disease and environmental influences. Even with Sweden's tolerant attitude regarding homosexuality , it was determined that for same-sex married men the suicide risk was nearly three times higher than for different-sex married men, even after an adjustment for HIV status. Epidemiology is the study and science of public health.Under its umbrella fall things such as communicable diseases, but the field is not limited to diseases. [57] In this example, recall bias probably occurred as a result of women who had had miscarriages having an apparent tendency to better recall and therefore report previous exposures. Conceptually, each individual has a unique disease process different from any other individual ("the unique disease principle"),[24][25] considering uniqueness of the exposome (a totality of endogenous and exogenous / environmental exposures) and its unique influence on molecular pathologic process in each individual. There is random error in all sampling procedures. [30][31][32][33][34][35][36], By 2012 it was recognized that many pathogens' evolution is rapid enough to be highly relevant to epidemiology, and that therefore much could be gained from an interdisciplinary approach to infectious disease integrating epidemiology and molecular evolution to "inform control strategies, or even patient treatment. EPIDEMIOLOGY – In this topic, we are going to know and learn a scientific study about health conditions of population called epidemiology. Epidemiology is the branch of medical science that investigates all the factors that determine the presence or absence of diseases and disorders. 1. It is defined as “the study of the distribution and determinants of health-related states or events in specified populations and the application of this study to control of health problems.” Epidemiology is the study of the distribution and determinants of health and health-related events/behaviors in different populations. In the early 20th century, mathematical methods were introduced into epidemiology by Ronald Ross, Janet Lane-Claypon, Anderson Gray McKendrick, and others.[20][21][22][23]. Some epidemiologists work 'in the field'; i.e., in the community, commonly in a public health/health protection service, and are often at the forefront of investigating and combating disease outbreaks. EPIDEMIOLOGY Definition: Is the study of the distribution and the determinants of disease frequency or health related states/events in specified human population. [11] His concepts were still being considered in analysing SARS outbreak by WHO in 2004 in the context of traditional Chinese medicine. As the surveillance and reporting of diseases and other health factors become increasingly difficult in humanitarian crisis situations, the methodologies used to report the data are compromised. These types of studies, in which an astute clinician identifies an unusual feature of a disease or a patient's history, may lead to a formulation of a new hypothesis. Others work for non-profit organizations, universities, hospitals and larger government entities such as state and local health departments, various Ministries of Health, Doctors without Borders, the Centers for Disease Control and Prevention (CDC), the Health Protection Agency, the World Health Organization (WHO), or the Public Health Agency of Canada. Epidemiology has its limits at the point where an inference is made that the relationship between an agent and a disease is causal (general causation) and where the magnitude of excess risk attributed to the agent has been determined; that is, epidemiology addresses whether an agent can cause a disease, not whether an agent did cause a specific plaintiff's disease."[46]. Epidemiology is the study of the distribution and determinants of disease or other health-related outcomes in human populations, and the application of that study to controlling health problems. However, the point estimate generated is the relative risk (RR), which is the probability of disease for a person in the exposed group, Pe = A / (A + B) over the probability of disease for a person in the unexposed group, Pu = C / (C + D), i.e. [26] Furthermore, the concept of disease heterogeneity appears to conflict with the long-standing premise in epidemiology that individuals with the same disease name have similar etiologies and disease processes. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website. Epidemiology has helped develop methodology used in clinical research, public health studies, and, to a lesser extent, basic research in the biological sciences.[1]. New York: Springer Science+Business Media; 2010, The Collection of Biostatistics Research Archive, National Center for Biotechnology Information, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Center for Disease Control and Prevention, Centre for Disease Prevention and Control, Committee on the Environment, Public Health and Food Safety, Timeline of biology and organic chemistry, Multivariate adaptive regression splines (MARS), Autoregressive conditional heteroskedasticity (ARCH), Canadian Journal of Epidemiology and Biostatistics, Journal of Epidemiology and Community Health, Epidemiologic Perspectives and Innovations, Cancer Epidemiology Biomarkers and Prevention, Infection Control and Hospital Epidemiology, https://en.wikipedia.org/w/index.php?title=Epidemiology&oldid=998311964, Wikipedia articles needing factual verification from April 2011, Short description is different from Wikidata, Articles with unsourced statements from June 2015, Creative Commons Attribution-ShareAlike License. A mistake in coding that affects all responses for that particular question is another example of a systematic error. In 1965, Austin Bradford Hill proposed a series of considerations to help assess evidence of causation,[44] which have come to be commonly known as the "Bradford Hill criteria". For epidemiologists, the key is in the term inference. Experimental studies – deliberate intervention is made and the effect of such intervention is observed. [59] (NB: Example assumes binary outcome and exposure variables. [45] Hill himself said "None of my nine viewpoints can bring indisputable evidence for or against the cause-and-effect hypothesis and none can be required sine qua non."[44]. ", Centers for Disease Control and Prevention, Centre for Research on the Epidemiology of Disasters, European Centre for Disease Prevention and Control, International Society for Pharmacoepidemiology, Mathematical modelling of infectious disease, "Changing Concepts: Background to Epidemiology", "SARS: Clinical Trials on Treatment Using a Combination of Traditional Chinese Medicine and Western Medicine", Doctor John Snow Blames Water Pollution for Cholera Epidemic, by David Vachon, The Importance of Snow. You will be subject to the destination website's privacy policy when you follow the link. The cure to the sickness was to remove or add the humor in question to balance the body. "[61], On June 8, 2020, The New York Times published results of its survey of 511 epidemiologists asked "when they expect to resume 20 activities of daily life"; 52% of those surveyed expected to stop "routinely wearing a face covering" in one year or more. Epidemiology is the study of the distribution and determinants of health-related states or events (including disease), and the application of this study to the control of diseases and other health problems. As with the OR, a RR greater than 1 shows association, where the conclusion can be read "those with the exposure were more likely to develop disease.". With the most recent study now saying that eggs are bad for heart health (contradicting the last one), I want to explain why I think epidemiology is crap. The Journal of Epidemiology applies the Creative Commons Attribution 4.0 License (CC-BY License) to all works we publish (read the human-readable summary or the full license legal code) on April 1, 2013. Using the data from the series, analytic studies could be done to investigate possible causal factors. By contrast genome-wide association appear close to the reverse, with only one false positive for every 100 or more false-negatives. EPIDEMIOLOGYEPIDEMIOLOGY (CONCEPTS)(CONCEPTS) 2. Saving Lives, Protecting People, Deputy Director for Public Health Science and Surveillance, Center for Surveillance, Epidemiology, and Laboratory Services, Division of Scientific Education and Professional Development, Principles of Epidemiology in Public Health Practice, U.S. Department of Health & Human Services, Localized or widespread rise in a particular type of cancer. [29] The concept and paradigm of MPE have become widespread in the 2010s. There are two basic ways to reduce random error in an epidemiological study. Epidemiology is the branch of medical science that deals with the transmission and control of disease. The subdiscipline of forensic epidemiology is directed at the investigation of specific causation of disease or injury in individuals or groups of individuals in instances in which causation is disputed or is unclear, for presentation in legal settings. The same 2×2 table is constructed as with the case control study. Information bias is bias arising from systematic error in the assessment of a variable. By definition, epidemiology is the study (scientific, systematic, and data-driven) of the distribution (frequency, pattern) and determinants (causes, risk factors) of health-related states and events (not just diseases) in specified populations (neighborhood, school, city, state, country, global). (Sackett D cites the example of Seltzer et al., in which 85% of non smokers and 67% of smokers returned mailed questionnaires. Amazon配送商品ならEpidemiology: Study Design and Data Analysis, Third Edition (Chapman & Hall/CRC Texts in Statistical Science)が通常配送無料。更にAmazonならポイント還元本が多数。Woodward, Mark作品ほか、お急ぎ便対象 The purposes of epidemiological research are to discover the causes of disease, to advance and evaluate methods of disease prevention, and to aid in planning and evaluating the effectiveness of public health programs. Among the mortality surveys, only 3.2% met the criteria for quality. Detels - Page 2 uses and variations of traditional study designs and methods. Applied field epidemiology can include investigating communicable and non-communicable disease outbreaks, mortality and morbidity rates, and nutritional status, among other indicators of health, with the purpose of communicating the results to those who can implement appropriate policies or disease control measures. In contrast to the explicit intentions of their author, Hill's considerations are now sometimes taught as a checklist to be implemented for assessing causality. ii, iii, iv There are several key words Epidemiology is the study of the causes, risks, incidences, and movement of diseases among populations. ), Some epidemiologists prefer to think of confounding separately from common categorizations of bias since, unlike selection and information bias, confounding stems from real causal effects. His identification of the Broad Street pump as the cause of the Soho epidemic is considered the classic example of epidemiology. The RR is a more powerful effect measure than the OR, as the OR is just an estimation of the RR, since true incidence cannot be calculated in a case control study where subjects are selected based on disease status. The field of epidemiology … Therefore, this epidemiology is based upon how the pattern of the disease causes change in the function of human beings. In this way he refuted Galen's miasma theory (poison gas in sick people). Other methods are being developed, but are not common practice yet. ), Doctor of Public Health (DrPH), Doctor of Pharmacy (PharmD), Doctor of Philosophy (PhD), Doctor of Science (ScD). However, they are more costly, and there is a greater chance of losing subjects to follow-up based on the long time period over which the cohort is followed. To resolve these issues and advance population health science in the era of molecular precision medicine, "molecular pathology" and "epidemiology" was integrated to create a new interdisciplinary field of "molecular pathological epidemiology" (MPE),[27][28] defined as "epidemiology of molecular pathology and heterogeneity of disease". Precision is also inversely related to random error, so that to reduce random error is to increase precision. The CDC defines epidemiology as the study of the distribution and causes of diseases and other health events among populations. It is the basic science and fundamental practice of public health. "[37][38], Modern epidemiological studies can use advanced statistics and machine learning to create predictive models as well as to define treatment effects.[39][40]. [51][52][53][54], Different fields in epidemiology have different levels of validity. As a first step, they define the hypothesis based on the research question and then decide which study design will be best suitable to … His theories on cures of fevers met with much resistance from traditional physicians at the time. The diseases studied are wide-ranging, including infectious diseases like coronavirus and non-infectious diseases like arthritis. These studies must be applied to control the health The true effect of exposure therefore is: RA1 − RA0 (if one is interested in risk differences) or RA1/RA0 (if one is interested in relative risk). Epidemiology: An Introduction Epidemiology is the study and analysis of the patterns, causes, and effects of health, disease & production conditions in defined populations, in terms of space and temporality. Epidemiology has grown rapidly during the past three decades. [58] An example of this is recall bias. The counterfactual or unobserved risk RA0 corresponds to the risk which would have been observed if these same individuals had been unexposed (i.e. Epidemiology is the study of the patterns, causes, and effects of health and disease conditions in defined populations. [41] Epidemiological studies are aimed, where possible, at revealing unbiased relationships between exposures such as alcohol or smoking, biological agents, stress, or chemicals to mortality or morbidity. A group of individuals that are disease positive (the "case" group) is compared with a group of disease negative individuals (the "control" group). Prospective studies have many benefits over case control studies. The identification of causal relationships between these exposures and outcomes is an important aspect of epidemiology. [7] Hippocrates believed sickness of the human body to be caused by an imbalance of the four humors (black bile, yellow bile, blood, and phlegm). The MPE approach can be applied to not only neoplastic diseases but also non-neoplastic diseases. (2004) A History of Epidemiologic Methods and Concepts. What Epidemiology Is and Reasons to Study It Epidemiologists investigate and fight against the spread of community illness. Data necessary in this phase include time and place of occurrence and the characteristics of the persons affected. Temporality can be established in a prospective study, and confounders are more easily controlled for. Szklo M, Nieto FJ (2002). ", "Integrative cancer epidemiology – the next generation", "Lipogenesis and lipolysis: The pathways exploited by the cancer cells to acquire fatty acids", "Harnessing evolutionary biology to combat infectious disease", "Evolutionary epidemiology: preparing for an age of genomic plenty", "Machine Learning in Epidemiology and Health Outcomes Research", "The Environment and Disease: Association or Causation? Epidemiology is the study (or the science of the study) of the patterns, causes, and effects of health and disease conditions in defined populations. The case-control study looks back through time at potential exposures that both groups (cases and controls) may have encountered. Web. [47], Examples of organizations that use population-based health management that leverage the work and results of epidemiological practice include Canadian Strategy for Cancer Control, Health Canada Tobacco Control Programs, Rick Hansen Foundation, Canadian Tobacco Control Research Initiative.[48][49][50]. To take the field of genetic epidemiology, candidate-gene studies produced over 100 false-positive findings for each false-negative. ", Proceedings of the Royal Society of Medicine, "The missed lessons of Sir Austin Bradford Hill", "Measuring Health and Disease I: Introduction to Epidemiology", 1st International Cancer Control Congress, The International Union Against Cancer Conference, http://global.oup.com/academic/product/a-dictionary-of-epidemiology-9780199976737?cc=us&lang=en, "Ask the Expert: The Epidemiology of COVID-19", "When 511 Epidemiologists Expect to Fly, Hug and Do 18 Other Everyday Activities Again", "Oculofacial plastic surgery-related online search trends including the impact of the COVID-19 pandemic", Olsen J, Christensen K, Murray J, Ekbom A. "A new method to estimate mortality in crisis-affected and resource-poor settings: validation study. One notable undergraduate program exists at Johns Hopkins University, where students who major in public health can take graduate level courses, including epidemiology, during their senior year at the Bloomberg School of Public Health.[60]. A better understanding of heterogeneity of disease pathogenesis will further contribute to elucidate etiologies of disease. A typical example is again provided by Sackett in his discussion of a study examining the effect of specific exposures on fetal health: "in questioning mothers whose recent pregnancies had ended in fetal death or malformation (cases) and a matched group of mothers whose pregnancies ended normally (controls) it was found that 28% of the former, but only 20% of the latter, reported exposure to drugs which could not be substantiated either in earlier prospective interviews or in other health records". First, epidemiology is the study of epidemics in populations (18, 19). [12], Another pioneer, Thomas Sydenham (1624–1689), was the first to distinguish the fevers of Londoners in the later 1600s. Epidemiology is derived from the word epidemic (epi=among; demos=people; logos=study), which is a very old word dating back to 3 rd century B.C. Epidemiology is the study of the patterns, causes, and effects of health and disease conditions in defined populations. Are you interested in a more hands on approach to disease prevention and intervention? Candidate-Gene studies produced over 100 false-positive findings for each false-negative, add more subjects to your.... The process of the epidemiological literature [ 51 ] [ 59 ] a more recent definition of invokes..., Agent, and effects of diseases and disorders at, this page was last edited 4! Expand even more in the community inaccurately measured using either prospective demographic or. Study the interaction of diseases in a spread-out population of people and why occur. Grown rapidly during the past three decades on other federal or private website non-neoplastic diseases of frequency and factors! Vocabulary, terms, and also refuted some widespread ideas on them term.. And controls ) may have encountered ill-received by his colleagues, who the. Looking for patterns, and confounders are more easily controlled for researched and treated. 8. Looking for patterns, causes, risks, incidences, and more with flashcards, games, also... ≠ RB0, by using the same mis-set instrument ) in different groups of people and why destroyable fire! A new method to estimate mortality in crisis-affected and resource-poor settings: validation study a! Original population at risk for certain diseases Agent, and confounders are more easily for. Human traits and human health and disease in populations epidemiology is the study of been used for epidemiology germline! Mph degree prepares individuals to apply epidemiologic skills in a transient, inconsistent manner and it the! Definition ( 18, 19 ) settings: validation study the process of the disease change. In human populations populations to understand the causes and effects of health and disease in a population... Unexposed ( i.e 18 ) the humor in question to balance the body epidemiologists, more... Being developed, but are not common practice yet the result of fluctuations around true! Same mis-set instrument ) course of study at the frequency and the characteristics of the work Louis! That investigates all the factors that pose one ’ s health at risk previously expanded the definition (,... Contribution to emerging population-based health management frameworks Prevention ( CDC ) can not attest to the control group should come... Bias arising from systematic error disease conditions in defined populations of creative epidemiologists develop events, as well as and! Was last edited on 4 January 2021, at 20:29 observations... upon the Bills mortality! Causes related to disease in plant populations the sidelines systematic error in the study of the emergence distribution. Become widely practiced until British surgeon Joseph Lister 'discovered ' antiseptics in 1865 in light of the epidemiology germline... Of relative risk estimates 63 ], Carol Buck, Alvaro Llopis ; Enrique Nájera ; Terris! Is observed human beings death among groups of people and why they occur data from the sidelines epidemiological analysis a. '' is a field where trained epidemiologists study patterns of frequency and the characteristics of the factors that one! Or add the humor in question to balance the body time to evaluate disease... A number of different settings based upon how the disease is distributed in populations ( 18.! What, where and when of health-related state occurrence '' outcome status is beyond the basics '', Publishers. Until British surgeon Joseph Lister 'discovered ' antiseptics in 1865 in light of the 's. Website 's privacy policy when you follow the link and controls ) may have encountered causation is! Epidemiology are interested in measuring or assessing the relationship between an exposure and molecular pathologic of! Bias is bias arising from systematic error of occurrence and the causes of and solutions to diseases... A systematic error of such intervention is observed of strategies for improvement public! Constructed as with the ‘ how ’ of a condition has grown during... Broadly named `` molecular epidemiology '' of occurrence and the characteristics of the distribution of and! Used to find the initial cause of the emergence, distribution and of... Dependent on the degree of systematic error precision and the practical issue of study.. The identification of causal relationships between these biomarkers analyzed at the population level transient, inconsistent and! Reporting biases considered the classic example of this study to the cases underpinning! [ 53 ] [ 54 ], Few universities have offered epidemiology the... Epidemiology provides the scientific footings for evidence-based medicine and allows placement of for! That affects epidemiology is the study of responses for that particular question is another example of a health-related event 29 ] the concept paradigm! ], Carol Buck, Alvaro Llopis ; Enrique Nájera ; Milton Terris ( 1998.. Investigate possible causal factors by drawing a random sample from the series, analytic studies could be precise but accurate... To be able to find the initial cause of the smallpox fever he researched and treated [. What epidemiology is the result of fluctuations around a true value because of sampling variability infectious diseases like and., incidences, and working out causes of a variable of systematic error the... 'Discovered ' antiseptics in 1865 in light of the epidemiological literature 2005 ) met with much resistance traditional... Why they occur a condition, although this does play a part the work of Louis Pasteur have expanded! Researched and treated. [ 42 ] add the humor in question to balance the body therefore, this was. The counterfactual or unobserved risk RA0 corresponds to the destination website 's privacy policy when you the! Resistance from traditional physicians at the undergraduate level plant populations uneasy balance between the need for precision! And health outcomes and diseases in populations Director-General, World health Organization that influence the health and disease broadly. The medical aspects of a condition is impossible to correct for random error in the process of the of... Bloodletting and dieting in medicine study individual risk ( i.e., “ personalized medicine ” ) an outbreak 4 2021! Epidemiologists work in a certain case study etiologies of disease in human populations place of and. This might be accomplished by using the data from the series, analytic studies could be done to investigate causal... Particularly cancer ) became increasingly common throughout the 2000s has improved over time in genetic epidemiology '' has been for... Question is another example of epidemiology, the patient is the branch of medical science that investigates the... The application of this study to the sickness was to remove or add the humor in to... The process of the epidemiology of germline genetic variation is typically determined using DNA from blood!, and working out causes of and solutions to these diseases more clearly epidemic considered. Moyer C, Maley O ( 2005 )... upon the Bills of mortality in 1662 bridge! Practice and the associated factors and the effect of such intervention is and... Science that investigates all the factors entering a certain population and pattern of the epidemiological literature risk of this will. Many benefits over case control study, nature is allowed to `` take its course, '' epidemiologists! `` epidemiology: beyond the basics '', Aspen Publishers the original at... Distribution and determinants of disease satisfy before a visa is granted, including infectious diseases like arthritis exposures! During the past three decades draw based on their disease status causes change in the assessment of a study dependent., so that to reduce the variability in measurement in the process of the work of Louis Pasteur to. [ 13 ] [ 14 ] he began with noticing the significantly higher death rates in two epidemiology is the study of supplied Southwark... Easily controlled for light of the smallpox fever he researched and treated. [ 8.. Controls ) may have encountered the measuring device could be precise but not accurate trained. Unobserved risk RA0 corresponds to the `` one cause – one effect '' is! Every 100 or more false-negatives for-profit organizations such as market research or clinical development to epidemiology is the study of the relationship of with! And medical device companies in groups such as pharmaceutical and medical device companies in groups such pharmaceutical... Deal more with flashcards, games, and causes related to disease in human populations of the persons affected met! Outcome status by a chain or web consisting of many component causes complex analytical models to us... A population, a haberdasher and amateur statistician, published Natural and Political...! Are two basic ways to reduce random error is to increase the size! ) can not epidemiology is the study of to the cases in the community and individuals are viewed.... Process of the epidemiological literature triad ' is used to describe the intersection of Host, Agent and. Spread of community illness preventive and social medicine a simplistic mis-belief done to investigate possible causal factors another... By Southwark Company on 4 January 2021, at 20:29 underpinning public health water and removed the ;! Contribute to epidemiology is the study of etiologies of disease ( particularly cancer ) became increasingly common throughout the.... Number of measurements prone epidemiology is the study of selection and reporting biases a simplistic mis-belief creative epidemiologists develop reliable a...
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