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Psychiatric epidemiology is the study of the distribution and causes of mental disorder in the population. Over the past 30 years progress in psychiatric epidemiology has been slower than in other areas-for example, car- diovascular disease or cancer epidemiology, because of certain methodological problems that are just now being overcome. In particular the epidemiology of schizophrenia has suffered from two major difficulties: uncertainty about how to define a case, and the relative rarity of schizophrenia in the population.
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Cannon et al. (1996) studied this question.
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