Perinatal mortality by birth order in multiple pregnancy.
D001722:Birth Order; D036861:Delivery, Obstetric; D005260:Female; D005313:Fetal Death; D006801:Humans; D007226:Infant Mortality; D010922:Placenta Diseases; D011225:Pre-Eclampsia; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011783:Quadruplets; D011811:Quintuplets; D013997:Time Factors; D014310:Triplets; D014427:Twins