S Di Saverio1, A Gori2, E Chisari3, J Wheeler1, R Lim4. 1. Cambridge Colorectal and Emergency Surgery Unit, Addenbrooke's Hospital, Cambridge Biomedical Campus, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK. 2. University of Bologna, Bologna, Italy. 3. University of Catania, Catania, Italy. 4. Tripler Army Medical Center, Tripler, Hawaii, USA.