The importance of using placebo controls in nonpharmacological randomised trials

Affiliations

• ¹ Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom.
• ² Pain Research, Department of Surgery and Cancer, Faculty of Medicine, Imperial College, Chelsea and Westminster Hospital Campus, London, United Kingdom.
• ³ Department of Psychology and Behavioural Sciences, School of Business and Social Sciences, Aarhus University, Aarhus, Denmark.
• ⁴ Centre for Evidence Based Medicine, Nuffield Department of Primary Care Health Sciences, Radcliffe Observatory Quarter, Oxford, United Kingdom.