University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, University College London - Institute of Cardiovascular Science, University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, University College London - Institute of Epidemiology and Health Care, University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, University College London - Centre for Obesity Research, Homerton University Hospital NHS Foundation Trust - Bariatric Surgery Department, Whittington Health NHS Trust - Department of Surgery and University College London - Centre for Obesity Research

Imperial College London, Imperial College London, Imperial College London, Chelsea and Westminster Hospital, Chelsea and Westminster Hospital, Whittington Health NHS Trust - Department of Surgery and Maidstone and Tunbridge Wells NHS Trust