1. Bariatric Endoscopy Unit, HM Sanchinarro University Hospital, Madrid, Spain
2. Department of Gastroenterology and Hepatology, Singapore General Hospital, Singapore
3. Health Services Research Unit, Singapore General Hospital, Singapore
4. Clinical Diagonal, Barcelona, Spain
5. Hospital Universitario Quiron Dexeus, Barcelona, Spain
6. Department of General and Gastrointestinal Surgery, Hospital Universitario De Bellvitge, L'Hospitalet de Llobregat Barcelona, Spain
7. Department of General and Gastrointestinal Surgery, Hospital Universitari Vall d’Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain