1. Department of Surgery, Hospital Universitari Mútua de Terrassa, 08221 Barcelona, Spain
2. School of Medicine, Universitat Rovira i Virgili, 43003 Tarragona, Spain
3. Department of Surgery, Hospital General Granollers, School of Medicine, Universitat Internacional de Catalunya, Av Francesc Ribas 1, 08402 Granollers, Spain
4. Intensive Care Unit, Complexo Hospitalario Universitario A Coruña, 15006 A Coruña, Spain
5. Department of Surgery, Hospital Universitari de Tarragona Joan XXIII, 43005 Tarragona, Spain