title: Double-blinded, single-blinded, or just blind?
authors.forename: E J
authors.initials: EJ
authors.lastname: Norris
mesh_terms: D000698:Analgesia / Q000379:methods*; D000701:Analgesics, Opioid / Q000008:administration & dosage; D004311:Double-Blind Method; D006801:Humans; D009020:Morphine / Q000008:administration & dosage; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D016037:Single-Blind Method; D017409:Sufentanil / Q000008:administration & dosage
chemical_list: D000701:Analgesics, Opioid; D009020:Morphine; D017409:Sufentanil