NAS-NRC Twin Registry 1995 survey.
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D000368:Aged; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D009307:National Academy of Sciences, U.S.; D012042:Registries; D011795:Surveys and Questionnaires / Q000191:economics; D014427:Twins; D014481:United States