[Epidemiological study on clustering of leukemia].
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007938:Leukemia / Q000453:epidemiology* / Q000401:mortality; D008297:Male; D008875:Middle Aged