1. 1Department of Surgery, Hospital Parc Taulí Sabadell, Sabadell, Spain
2. 2Department of Surgery, Hospital General de l’Hospitalet, Hospitalet de Llobregat, Barcelona, Spain
3. 3Department of Surgery, Hospital Universitario de Guadalajara, Guadalajara, Spain
4. 4Department of Surgery, Hospital de la Santa Creu i Sant Pau Barcelona, Barcelona, Spain