title: Breakthrough pain in chronic persistent pain syndromes: emerging treatment options and implications for managed care. Introduction.
mesh_terms: D000701:Analgesics, Opioid / Q000627:therapeutic use; D002908:Chronic Disease; D006801:Humans; D009369:Neoplasms / Q000150:complications; D010146:Pain / Q000209:etiology; D059408:Pain Management
chemical_list: D000701:Analgesics, Opioid