title: Trial design for breakthrough pain: is it ethical to have a placebo in a trial? Author reply.
authors.affiliation: Ethypharm Corporation Saint Cloud, France.
authors.forename: Francoise
authors.initials: F
authors.lastname: Trinquet
mesh_terms: D000701:Analgesics, Opioid / Q000008:administration & dosage* / Q000627:therapeutic use*; D059390:Breakthrough Pain / Q000188:drug therapy*; D005260:Female; D005283:Fentanyl / Q000008:administration & dosage* / Q000627:therapeutic use*; D006801:Humans; D008297:Male
chemical_list: D000701:Analgesics, Opioid; D005283:Fentanyl