title: Is there a need to control the placebo in placebo controlled trials?
authors.forename: A J
authors.initials: AJ
authors.lastname: De Craen
authors.forename: J G
authors.initials: JG
authors.lastname: Tijssen
authors.forename: J
authors.initials: J
authors.lastname: Kleijnen
mesh_terms: D006801:Humans; D010919:Placebos; D016032:Randomized Controlled Trials as Topic; D012106:Research
chemical_list: D010919:Placebos