Twin pregnancy. The value of prophylactic rest in bed and the risk involved.
D001724:Birth Weight; D005260:Female; D005313:Fetal Death / Q000209:etiology / Q000517:prevention & control*; D005865:Gestational Age; D006760:Hospitalization; D006801:Humans; D007226:Infant Mortality; D007752:Obstetric Labor, Premature / Q000209:etiology / Q000517:prevention & control*; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012146:Rest; D014427:Twins