Fifth revision of Declaration of Helsinki. Clause 29 forbids trials from using placebos when effective treatment exists.
Bland
J M
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Kerr
David
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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
D010919:Placebos