1. Department of Surgery, Hospital General de Granollers, Barcelona, Spain.
2. Universitat Internacional de Catalunya, Barcelona, Spain.
3. Department of Clinical Microbiology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom.
4. Department of Surgery, Hospital Universitario la Paz, Madrid, Spain.
5. Department of Surgery, Hospital Universitari Vall d'Hebrón, Barcelona, Spain.
6. Department of Surgery, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Barcelona, Spain.
7. Universitat de Barcelona, Barcelona, Spain
8. Department of Surgery, Hospital Clínic de Barcelona, Barcelona, Spain.