1. Department of Colorectal Surgery, Georgia Colon and Rectal Surgical Clinic, Lawrenceville, United States,
2. Department of Radiology, National Institute of Geriatrics, Rheumatology and Rehabilitation, Warsaw, Poland,
3. Department of Medico Surgical Proctology, Institut Léopold Bellan, Hôpital Paris Saint-Joseph, Paris, France,
4. Proctology Unit, Fondazione Policlinico Universitario ‘A. Gemelli’ IRCCS, Rome, Italy,
5. Department of Colorectal Surgery, Portuguese Institute of Oncology of Lisbon, Lisbon, Portugal,
6. Department of Colorectal Surgery, Penang General Hospital, Penang, Malaysia,