1. Department of General Surgery, Centre Chirurgical de l'Obesite, ELSAN, Clinique Saint Michel, Toulon, France.
2. Department of General Surgery, Clinique Bouchard, ELSAN, Marseille, France.
3. Department of General Surgery, Emirates Specialty Hospital, Dubai, United Arab Emirates.
4. Department of General Surgery, Endocrine, Metabolic and Bariatric Unit, General Surgery Department, Hospital Vall d'Hebron, Barcelona, Spain.
5. Department of General Surgery, Universitat Autònoma de Barcelona, Barcelona, Spain.
6. Department of Digestive and Bariatric Surgery, Clinica Madonna della Salute, Porto Viro, Italy.