PLACEBOS IN OBSTETRICAL ANALGESIA.
D016362:Analgesia, Obstetrical; D000758:Anesthesia; D000773:Anesthesia, Obstetrical; D000776:Anesthesiology; D005260:Female; D006801:Humans; D009774:Obstetrics; D010919:Placebos; D011247:Pregnancy
D010919:Placebos
ANESTHESIA, OBSTETRICAL; PLACEBOS; PREGNANCY