Severe chronic pain: reassessing drug therapy.
D000700:Analgesics / Q000008:administration & dosage / Q000627:therapeutic use*; D000701:Analgesics, Opioid / Q000627:therapeutic use; D002908:Chronic Disease; D004361:Drug Tolerance; D006801:Humans; D010146:Pain / Q000188:drug therapy* / Q000209:etiology; D013727:Terminal Care
D000700:Analgesics; D000701:Analgesics, Opioid