title: The twin and twin-family approach to cross-cultural aging research.
mesh_terms: D000222:Adaptation, Physiological; D000223:Adaptation, Psychological; D000375:Aging; D003431:Cross-Cultural Comparison; D003718:Denmark; D005190:Family; D005260:Female; D005826:Genetics, Medical; D006801:Humans; D007558:Italy; D011247:Pregnancy; D012042:Registries; D012106:Research; D013312:Stress, Physiological; D013548:Sweden; D014427:Twins; D014481:United States