title: The Finnish Twin Registry: formation and compilation, questionnaire study, zygosity determination procedures, and research program.
mesh_terms: D000328:Adult; D001789:Blood Group Antigens; D005260:Female; D005387:Finland; D005838:Genotype; D006801:Humans; D008297:Male; D011247:Pregnancy; D012042:Registries; D012107:Research Design; D011795:Surveys and Questionnaires; D014427:Twins
chemical_list: D001789:Blood Group Antigens