1. Biochemistry and Molecular Biology, Department of Medicine, University of Calgary Cumming School of Medicine, Calgary, Alberta, Canada
2. Centre for Obesity Research, Department of Medicine, University College London, London, UK
3. Bariatric Centre for Weight Management and Metabolic Surgery, University College London Hospital, London, UK
4. National Institute for Health Research, Biomedical Research Centre, University College London Hospital, London, UK
5. School of Medicine, University College Dublin, Dublin, Ireland