Exploring the use of the sham design for interventional trials: implications for endoscopic research.
D002986:Clinical Trials as Topic / Q000592:standards*; D016099:Endoscopy, Gastrointestinal; D032984:Ethics, Research; D006801:Humans; D010919:Placebos / Q000592:standards; D012107:Research Design / Q000592:standards*
D010919:Placebos