NAS-NRC Twin Registry Survey. National Academy of Sciences--National Research Council.
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D000368:Aged; D004200:Diseases in Twins / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009307:National Academy of Sciences, U.S.; D012042:Registries; D018433:Twin Studies as Topic; D014481:United States