title: Fifth revision of Declaration of Helsinki. Clause 29 forbids trials from using placebos when effective treatment exists.
authors.forename: J M
authors.initials: JM
authors.lastname: Bland
authors.forename: David
authors.initials: D
authors.lastname: Kerr
mesh_terms: D035061:Control Groups; D018849:Controlled Clinical Trials as Topic / Q000379:methods*; D026690:Ethics, Clinical; D006381:Helsinki Declaration; D006801:Humans; D008297:Male; D010919:Placebos; D012107:Research Design
chemical_list: D010919:Placebos