title: Is lack of evidence the problem?
authors.affiliation: Penn Pain Medicine Center, Hospital of the University of Pennsylvania, 1840 South St, Philadelphia, PA 19146, USA.
authors.forename: Jane C
authors.initials: JC
authors.lastname: Ballantyne
mesh_terms: D000701:Analgesics, Opioid / Q000009:adverse effects / Q000627:therapeutic use*; D002908:Chronic Disease; D019317:Evidence-Based Medicine; D017408:Guidelines as Topic; D006801:Humans; D010146:Pain / Q000188:drug therapy*; D012106:Research; D014481:United States
chemical_list: D000701:Analgesics, Opioid