Analgesia--a diagnostic aid to some systematic diseases.
D000698:Analgesia; D003813:Dentistry; D006402:Hematologic Diseases / Q000175:diagnosis; D007003:Hypoglycemia / Q000175:diagnosis; D008881:Migraine Disorders / Q000175:diagnosis; D009609:Nitrous Oxide / Q000008:administration & dosage
D009609:Nitrous Oxide