[1] Univ Hosp Vall dHebron, European Ctr Excellence EAC BS, Gen Surg Dept, Endocrine Bariatr & Metab Unit, Barcelona, Spain
[2] Hosp Univ Vall dHebron, Gen Surg Dept, Barcelona, Spain
[3] Hosp Santa Creu & Sant Pau, Barcelona, Spain
[4] Hosp Univ, Hosp Gen Granollers, Dept Gen Surg Parc Tauli, Barcelona, Spain
[5] Univ Autonoma Barcelona, Barcelona, Spain
[6] Clin St Michel, ELSAN, Toulon, France