title: Long-Term Opioid Therapy for Chronic Pain.
authors.forename: J Walden
authors.initials: JW
authors.lastname: Retan
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000009:adverse effects*; D059350:Chronic Pain / Q000188:drug therapy*; D006801:Humans
chemical_list: D000701:Analgesics, Opioid