[1] University of Birmingham,Institute of Applied Health Research
[2] University of Liverpool,Biostatistics Department
[3] School of Medicine University of Colorado,Department of Ophthalmology
[4] University of Toronto,Applied Health Research Centre (AHRC), Li Ka Shing Knowledge Institute of St. Michael’s Hospital, Department of Medicine and Institute of Health Policy, Management and Evaluation
[5] University of Toronto,Department of Medicine, Women’s College Research Institute
[6] Institute of Clinical Trials & Methodology,MRC Clinical Trials Unit at UCL