1. Department of Upper Gastrointestinal Surgery, University College London Hospital , London , UK
2. Young IFSO, International Federation for the Surgery of Obesity and Metabolic Disorders , Naples , Italy
3. Department of Surgery, Vrinnevi Hospital , Norrköping , Sweden
4. Department of Biomedical and Clinical Sciences, Linköping University , Linköping , Sweden
5. Multinational Advisory Group for International Federation for the Surgery of Obesity and Metabolic Disorders European Chapter , Naples , Italy
6. Department of General Surgery, University Hospital Lewisham , London , UK
7. Nederlandse Obesitas Kliniek , The Hague and Gouda , The Netherlands
8. Department of Surgery, Groene Hart Ziekenhuis , Gouda , The Netherlands