1. General Surgery Department, Mansoura University Hospitals, Mansoura, Egypt
2. General Surgery Department, King Faisal Medical Complex, TAIF, Saudia Arabia
3. General Surgery Department, Alhada Armed Forces hospital, Saudia Arabia
4. College of Medicine, Taif University, Saudia Arabia
5. Gastroenterology Department, King Faisal Medical Complex, TAIF, Saudia Arabia
6. General Surgery Department, Faculty of Medicine, Al-Azhar university, Cairo, Egypt