More than a lot of hot air.
Toulson
S
S
D000698:Analgesia / Q000379:methods / Q000451:nursing; D004338:Drug Combinations / Q000008:administration & dosage; D006801:Humans; D009609:Nitrous Oxide / Q000008:administration & dosage*; D010100:Oxygen / Q000008:administration & dosage*
D004338:Drug Combinations; C001147:Entonox; D009609:Nitrous Oxide; D010100:Oxygen