NAS-NRC Twin Registry Survey.
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D000328:Adult; D000368:Aged; D000437:Alcoholism / Q000235:genetics*; D004200:Diseases in Twins / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012042:Registries / Q000706:statistics & numerical data*; D014429:Twins, Dizygotic / Q000235:genetics; D014430:Twins, Monozygotic / Q000235:genetics; D014728:Veterans / Q000523:psychology