1 From the Comprehensive Clinical Trials Unit at UCL (E.B.), Institute of Clinical Trials and Methodology, University College London, United Kingdom; Department of Applied Health Research (R.M.H.), Institute of Epidemiology and Health Care, University College London, United Kingdom.
2 From the Comprehensive Clinical Trials Unit at UCL (E.B.), Institute of Clinical Trials and Methodology, University College London, United Kingdom; Department of Applied Health Research (R.M.H.), Institute of Epidemiology and Health Care, University College London, United Kingdom. [email protected].