The obstetrician's role in preventing birth defects.
D000013:Congenital Abnormalities / Q000517:prevention & control*; D005260:Female; D006266:Health Education; D006801:Humans; D007231:Infant, Newborn; D009747:Nutritional Physiological Phenomena; D007752:Obstetric Labor, Premature / Q000517:prevention & control*; D009774:Obstetrics; D011247:Pregnancy