Effectiveness and safety of high-dose opioids for chronic pain.
Johnston
Scott
S
D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000009:adverse effects*; D002908:Chronic Disease; D004305:Dose-Response Relationship, Drug; D006801:Humans; D010146:Pain / Q000188:drug therapy*
D000701:Analgesics, Opioid