title: The Swedish Twin Registry.
mesh_terms: D000368:Aged; D000437:Alcoholism / Q000453:epidemiology; D004200:Diseases in Twins / Q000453:epidemiology*; D004812:Epidemiologic Methods; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D011247:Pregnancy; D012042:Registries; D012907:Smoking / Q000453:epidemiology; D011795:Surveys and Questionnaires; D013548:Sweden; D014427:Twins