1. Centre for Obesity and Diabetes, Oswaldo Cruz German Hospital , Sao Paulo , Brazil
2. Division of Digestive Surgery and Urology, Turku University Hospital , Turku , Finland
3. Department of Surgery, University of Turku , Turku , Finland
4. Metamor Institute, Pennington Biomedical Research Center , Baton Rouge, LA , USA
5. Bariatric and Metabolic Surgery, King’s College Hospital , London , UK