1. Department of Emergency and Organ Transplantation, University Aldo Moro of Bari, Bari, Italy
2. Centre for Colorectal Disease, St Vincent's University Hospital, University College Dublin, Dublin, Ireland
3. Department of Visceral Surgery, University Hospital Lausanne, Lausanne, Switzerland
4. Department of Medical and Surgical Sciences, University of Catanzaro, Catanzaro, Italy
5. Department of General Surgery, Colorectal Unit, Hospital Universitari MútuaTerrassa, Terrassa, Barcelona, Spain
6. Department of Proctology, Krankenhaus Barmherzige Brüder, Regensburg, Germany
7. Department of Surgery, Università Vita Salute San Raffaele, Milano, Italy
8. Department of Surgery, Tor Vergata University, Rome, Italy
9. Department of Surgery, Division of General Surgery, Medical University Vienna, Vienna, Austria
10. Istituto Humanitas Gavazzeni & Castelli, Proctology and Perineology Surgical Unit, Bergamo, Italy
11. Proctology and Pelvic Floor Clinical Centre, Cisanello University Hospital, Pisa, Italy
12. Department of General Surgery, Colorectal Unit, Elche University Hospital, Miguel Hernández University, Alicante, Spain
13. Gastrointestinal Surgery Department, Coloproctology Unit, Virgen del Rocio University Hospital, Seville, Spain
14. I. M. Sechenov First Moscow State Medical University (Sechenov University), Clinic of Coloproctology and Minimally Invasive Surgery, Moscow, Russia
15. Division of Digestive Surgery, Proctology Unit, University Hospitals of Geneva, Geneva, Switzerland
16. Department of General, Gastrointestinal and Colorectal Surgery, Amalie Sieveking Hospital, Hamburg, Germany
17. Department of Colorectal Surgery, Santa Rita Clinic, Vercelli, Italy
18. Department of Abdominal Surgery, UZ Leuven, Leuven, Belgium
19. Chirurgische Klinik, Universität Erlangen, Erlangen, Germany
20. Department of Surgery, Creta Interclinic Hospital of Heraklion, Heraklion, Greece
21. Department of Surgery, Aarhus University Hospital, Aarhus, Denmark
22. Proctology Unit, Fondazione Policlinico Universitario ‘A. Gemelli’ IRCCS, Rome, Italy
23. Department of Surgery, University Medical Centre Groningen, Groningen, the Netherlands
24. Department of Surgery, General Surgery Unit, Santa Maria dei Battuti Hospital, Pordenone, Italy
25. Department of Colorectal Surgery, Beaujon Hospital, Assistance Publique–Hôpitaux de Paris, Université Paris VII, Clichy, France
26. General Surgery and Transplantation Unit, Department of Medicine, University of Udine, Udine, Italy
27. Department of Surgery, Hospital Universitari Vall d'Hebrón, Barcelona, Spain
28. Department of Surgery, Colorectal Unit, Michallon University Hospital, Grenoble, France
29. General Surgery Department, University of Milano-Bicocca, Istituti Clinici Zucchi, Monza, Italy
30. Department of Surgery, Cantonal Hospital Winterthur, Winterthur, Switzerland
31. Coloproctology Unit, Ospedale Regionale di Lugano, Lugano, Switzerland