title: Local opioid analgesia at cervical sympathetic ganglia: what is the contribution of placebo effect?
authors.forename: Pavel
authors.initials: P
authors.lastname: Michalek
authors.forename: Tomás
authors.initials: T
authors.lastname: Gabrhelík
mesh_terms: D000698:Analgesia / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage*; D001340:Autonomic Nerve Block; D002047:Buprenorphine / Q000008:administration & dosage*; D002986:Clinical Trials as Topic / Q000379:methods; D004334:Drug Administration Schedule; D005157:Facial Pain / Q000188:drug therapy*; D006261:Headache / Q000188:drug therapy*; D006801:Humans; D015990:Placebo Effect; D012107:Research Design; D013233:Stellate Ganglion; D016896:Treatment Outcome
chemical_list: D000701:Analgesics, Opioid; D002047:Buprenorphine