title: A matched-pair register for studies of selected congenital defects.
mesh_terms: D000022:Abortion, Spontaneous; D000033:Abortion, Threatened; D001724:Birth Weight; D002490:Central Nervous System / Q000002:abnormalities; D000013:Congenital Abnormalities / Q000453:epidemiology*; D003644:Death Certificates; D004358:Drug Therapy; D005260:Female; D005313:Fetal Death; D005387:Finland; D006801:Humans; D007231:Infant, Newborn; D007251:Influenza, Human / Q000453:epidemiology; D008393:Marriage; D008423:Maternal Age; D008427:Maternal Health Services; D008487:Medical History Taking; D009139:Musculoskeletal Abnormalities; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000453:epidemiology; D012042:Registries / Q000379:methods*; D012306:Risk; D011795:Surveys and Questionnaires