1Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
2Manchester Academic Health Sciences Centre, Manchester, UK
3Wrightington, Wigan and Leigh NHS Trust, Wigan, UK
4Queen Alexandra Hospital, Portsmouth, UK
5Division of Surgery & Interventional Science, University College London, London, UK
6Wellcome EPSRC Centre for Surgical & Interventional Science, University College London, UK
7University College London Hospitals, London, UK
8Salford Royal NHS Foundation Trust, Salford, UK
9Queen's Medical Centre Campus, University of Nottingham, Nottingham, UK