Prevalence and severity of periodontal disease in a Swedish population. I. Methods and material.
D000293:Adolescent; D000328:Adult; D000368:Aged; D003116:Color; D004493:Education; D006801:Humans; D008297:Male; D008875:Middle Aged; D010510:Periodontal Diseases / Q000000981:diagnostic imaging / Q000453:epidemiology*; D010512:Periodontal Index; D010781:Photography; D011676:Punched-Card Systems; D011859:Radiography; D012494:Sampling Studies; D012924:Social Conditions; D013548:Sweden