The Erie County survey of long-term childhood illness. I. Methodology.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003550:Cystic Fibrosis / Q000453:epidemiology* / Q000401:mortality*; D006306:Health Surveys; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009518:New York; D010182:Pancreatic Diseases / Q000453:epidemiology* / Q000401:mortality*; D012494:Sampling Studies