Pain relief in hospital: the more widespread use of nitrous oxide.
D000698:Analgesia; D006761:Hospitals; D006801:Humans; D008722:Methods; D009609:Nitrous Oxide; D011182:Postoperative Care; D012138:Respiratory Therapy; D012651:Self Medication; D014947:Wounds and Injuries / Q000628:therapy
D009609:Nitrous Oxide