1. University of Rome Tor Vergata, Department of Surgery, Rome, Italy
2. Portsmouth Hospital, NHS trust, Surgery, Portsmouth, UK
3. Saint Mark’s Hospital, Surgery, London, UK
4. University of Rome Tor Vergata, Department of Mathematics, Rome, Italy
5. Istituto Clinico Humanitas, Colorectal Surgery, Rozzano, Italy
6. Cedars Sinai Hospital, Surgery, Los Angeles, CA, USA
7. Beaujon Hospital, Colorectal Surgery, Paris, France
8. Rho Memorial Hospital, Surgery, Milan, Italy
9. Baylor University Medical Center, Surgery, Dallas, TX, USA
10. Hospital Universitario La Fe, Surgery, Valencia, Spain
11. Hospital Universitario Val d’Hebron, Surgery, Barcelona, Spain
12. MD Anderson Center, Surgery, Houston, TX, USA
13. Università Federico II, Surgery, Napoli, Italy