title: Opioid therapy for chronic nonmalignant pain: clinician's perspective.
authors.forename: R K
authors.initials: RK
authors.lastname: Portenoy
mesh_terms: D000701:Analgesics, Opioid / Q000627:therapeutic use*; D001291:Attitude of Health Personnel; D002908:Chronic Disease; D006801:Humans; D010148:Intractable Pain / Q000188:drug therapy*; D010820:Physicians / Q000523:psychology*; D019966:Substance-Related Disorders / Q000517:prevention & control
chemical_list: D000701:Analgesics, Opioid