[An epidemiologic, genetic and sociopsychiatric study of mentally retarded children in Kunneppu town, Hokkaido].
D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000453:epidemiology* / Q000235:genetics*; D007564:Japan; D011247:Pregnancy; D012923:Social Class