1. Department of Surgery, Haaglanden Medical Center, The Hague, The Netherlands
2. Department of Cardiothoracic Surgery, Amsterdam, The Netherlands
3. Nederlandse Obesitas Kliniek West, The Hague, The Netherlands
4. Metabolic Surgery Clinic, Istanbul, Turkey
5. Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
6. Centro Multidisciplinar da Doença Metabólica, Clínica de Santo António, Lisbon, Portugal
7. Department of Surgery, Whittington Hospital, London, UK
8. Bariatric & Metabolic Surgery Clinic, Kirloskar Hospital, Hyderabad, India