Safety of the low-forceps operation.
D001034:Apgar Score; D001724:Birth Weight; D002675:Child, Preschool; D036861:Delivery, Obstetric; D004522:Educational Status; D005113:Extraction, Obstetrical; D005260:Female; D005313:Fetal Death; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D007361:Intelligence Tests; D007746:Labor Presentation; D009048:Motor Skills; D007744:Obstetric Labor Complications / Q000517:prevention & control; D009772:Obstetrical Forceps; D010298:Parity; D011247:Pregnancy; D011446:Prospective Studies; D044469:Racial Groups; D013997:Time Factors