title: Opioids for persistent non-cancer pain.
authors.forename: Eija
authors.initials: E
authors.lastname: Kalso
mesh_terms: D000701:Analgesics, Opioid / Q000627:therapeutic use*; D017408:Guidelines as Topic; D006801:Humans; D010148:Intractable Pain / Q000209:etiology / Q000517:prevention & control*
chemical_list: D000701:Analgesics, Opioid