[Epidemiological study of periodontal disease in rural Korea].
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007723:Korea; D008297:Male; D008875:Middle Aged; D010510:Periodontal Diseases / Q000453:epidemiology*; D012424:Rural Population