High frequency studies in school children in nine countries.
D000293:Adolescent; D001110:Arctic Regions; D001299:Audiometry; D001444:Bahamas; D002648:Child; D003327:Coronary Disease / Q000453:epidemiology; D004036:Diet, Atherogenic; D005260:Female; D005387:Finland; D006311:Hearing Disorders / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008403:Mass Screening; D008521:Mediterranean Islands; D009518:New York; D012572:School Health Services; D013397:Sudan; D014586:USSR; D015022:Yugoslavia