Problems of prematurity.
D002585:Cesarean Section; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007752:Obstetric Labor, Premature / Q000209:etiology* / Q000517:prevention & control; D010922:Placenta Diseases / Q000150:complications; D011247:Pregnancy; D002577:Uterine Cervical Diseases / Q000150:complications