Childbirth preparation at urban clinics.
D000328:Adult; D000773:Anesthesia, Obstetrical; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D009321:Natural Childbirth; D010353:Patient Education as Topic; D011247:Pregnancy; D012189:Retrospective Studies; D014505:Urban Population