1. Department of General Surgery, Hospital Universitari Germans Trias i Pujol, School of Medicine, Universitat Autònoma de Barcelona, Institut de Recerca Germans Trias i Pujol – IGTP, Barcelona, Spain
2. Department of General Surgery, King’s College London, London, England
3. Department of General Surgery, ASUGI Cattinara, Università degli studi di Trieste, Trieste, Italy