Many chronic diseases are of unknown etiology but may be related to environmental exposures this report the second of the committee on environmental epidemiology of the national research councils commission on life sciences considers what information is needed to determine the prevalence of these diseases and whether they are a result of environmental exposures. The term molecular epidemiology emerged apparently independently during the 1970s to early 1980s in the literature of three separate substantive areas of epidemiology cancer epidemiology environmental epidemiology and infectious disease epidemiology although these separate substantive areas agree that epidemiology refers to the distribution . Epidemiology is the study of the distribution and causes of disease it aims to solve or control health problems epidemiology integrates experiments risk assessment statistical analysis surveys and interviews to study disease patterns
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