title: [Sample study of twins in the Central Volga district].
mesh_terms: D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006801:Humans; D008297:Male; D011247:Pregnancy; D012426:Russia; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
vernacular_title: Issledovaniia bliznetsovoĭ vyborki Srednego Povolzh'ia