1. Department of Colorectal Surgery, Newcastle upon Tyne Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK
2. The John Goligher Colorectal Unit, St James's University Hospital, Leeds, UK
3. Department of Colon and Rectal Surgery, Florida Hospital, Orlando, Florida, USA
4. Department of Colorectal Surgery, University College London, London, UK
5. Department of Surgery, Hospital Clinico, Instituto de Investigación Sanitaria San Carlos, Universidad Compluntense de Madrid, Madrid, Spain
6. Department of Gastrointestinal Surgery, Hospital Clinic of Barcelona, University of Barcelona, Barcelona, Spain
7. Digestive Disease Center, Department of Colorectal Surgery, Cleveland Clinic Florida, Weston, Florida, USA