Decisive factors in designing the Sudbury study of chronic disease.
D001172:Arthritis, Rheumatoid / Q000453:epidemiology*; D002908:Chronic Disease / Q000453:epidemiology; D003920:Diabetes Mellitus / Q000453:epidemiology*; D006073:Gout / Q000453:epidemiology*; D006306:Health Surveys; D006801:Humans; D008404:Massachusetts