The use of entonox in the ambulance service.
D000488:Allied Health Personnel; D000552:Ambulances; D000698:Analgesia; D000776:Anesthesiology / Q000193:education; D006801:Humans; D009609:Nitrous Oxide / Q000008:administration & dosage* / Q000009:adverse effects; D010100:Oxygen / Q000008:administration & dosage
D009609:Nitrous Oxide; D010100:Oxygen