Methoxyflurane, nitrous oxide, oxygen analgesia for delivery.
D000773:Anesthesia, Obstetrical; D005260:Female; D006801:Humans; D008733:Methoxyflurane; D009609:Nitrous Oxide; D010100:Oxygen; D011247:Pregnancy
D008733:Methoxyflurane; D009609:Nitrous Oxide; D010100:Oxygen