Mode of delivery and survival in babies weighing less than 2000 g.
D001946:Breech Presentation; D002585:Cesarean Section; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007746:Labor Presentation; D011247:Pregnancy; D012306:Risk