title: The margins of safety in nitrous oxide-oxygen analgesia.
mesh_terms: D000698:Analgesia; D006801:Humans; D009609:Nitrous Oxide / Q000008:administration & dosage / Q000009:adverse effects; D010100:Oxygen / Q000008:administration & dosage
chemical_list: D009609:Nitrous Oxide; D010100:Oxygen