1. Ellen Leifer Shulman and Steven Shulman Digestive Disease Center, Cleveland Clinic Florida Weston Florida USA
2. General Surgery Department, Colorectal Surgery Unit Mansoura University Hospitals Mansoura Egypt
3. Georgia Colon and Rectal Surgical Associates Northside Hospital Atlanta Georgia USA
4. Department of General Surgery, Faculty of Medicine Hadassah Medical Organization, Hebrew University of Jerusalem Jerusalem Israel
5. Department of Surgery and Transplantations Sheba Medical Center Ramat Gan Israel
6. Department of Surgery University of Port Harcourt Choba Choba Nigeria