Intrathecal morphine sulfate for labor pain.
D000328:Adult; D000767:Anesthesia, Epidural; D000771:Anesthesia, Intravenous; D000773:Anesthesia, Obstetrical; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D009020:Morphine; D011247:Pregnancy
D009020:Morphine