title: Annotation: the National Academy of Sciences-National Research Council Twin Registry.
authors.affiliation: Medical Follow-Up Agency, National Academy of Sciences, Washington, DC, USA.
authors.forename: W F
authors.initials: WF
authors.lastname: Page
mesh_terms: D006801:Humans; D009307:National Academy of Sciences, U.S.; D012042:Registries; D018433:Twin Studies as Topic; D014427:Twins; D014481:United States