Aetiological factors in prematurity.
D000293:Adolescent; D000328:Adult; D001724:Birth Weight; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D007752:Obstetric Labor, Premature / Q000453:epidemiology / Q000209:etiology*; D011225:Pre-Eclampsia / Q000150:complications; D011247:Pregnancy; D011248:Pregnancy Complications / Q000150:complications*; D011272:Pregnancy, Multiple; D012189:Retrospective Studies; D012907:Smoking; D012924:Social Conditions