title: Prenatal x-ray exposure and twins.
mesh_terms: D004200:Diseases in Twins; D005260:Female; D005333:Fetus / Q000528:radiation effects; D006801:Humans; D009381:Neoplasms, Radiation-Induced / Q000453:epidemiology*; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D011859:Radiography / Q000009:adverse effects*