Nitrous oxide/oxygen in the London Ambulance Service.
D000328:Adult; D000552:Ambulances; D000769:Anesthesia, Inhalation; D002648:Child; D002986:Clinical Trials as Topic; D004338:Drug Combinations; D005392:First Aid; D006801:Humans; D009609:Nitrous Oxide / Q000627:therapeutic use*; D010100:Oxygen / Q000627:therapeutic use
D004338:Drug Combinations; D009609:Nitrous Oxide; D010100:Oxygen