Twin placentation and its complications.
D000650:Amnion; D002823:Chorion / Q000098:blood supply; D005260:Female; D005313:Fetal Death; D005330:Fetofetal Transfusion / Q000209:etiology; D006801:Humans; D010920:Placenta; D010929:Placentation; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014430:Twins, Monozygotic