Screening for twin pregnancy detection.
D005260:Female; D005313:Fetal Death / Q000517:prevention & control; D006801:Humans; D007226:Infant Mortality; D008403:Mass Screening; D010928:Placental Lactogen / Q000097:blood*; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D011272:Pregnancy, Multiple; D011296:Prenatal Diagnosis; D013548:Sweden; D014427:Twins; D014463:Ultrasonography
D010928:Placental Lactogen