1 Department of Diabetes, Endocrinology & Obesity Medicine, Salford Royal NHS Foundation & University Teaching Trust, Salford, UK; Division of Diabetes, Endocrinology & Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.
2 Department of Oesophago-Gastric & Bariatric Surgery, Salford Royal NHS Foundation Trust, Salford, UK; Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.
3 Department of Oesophago-Gastric & Bariatric Surgery, Salford Royal NHS Foundation Trust, Salford, UK.
4 Department of Anaesthesia, Salford Royal NHS Foundation & University Teaching Trust, Salford, UK.
5 Department of Diabetes, Endocrinology & Obesity Medicine, Salford Royal NHS Foundation & University Teaching Trust, Salford, UK; Division of Informatics, Imaging & Data Sciences, School of Health Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.