1. Digestive Diseases Unit, Rashid Hospital, Dubai 003206, United Arab Emirates
2. Department of Internal Medicine, Al-Azhar University, Cairo 11884, Egypt
3. Department of Medicine, Almana General Hospital, Alkhobar 31952, Saudi Arabia
4. Department of Medicine, King Faisal Specialist Hospital and Research Center, Riyadh 11564, Saudi Arabia
5. Al Madar Medical Centre, Sharjah P.O. Box 80789, United Arab Emirates
6. Division of Gastroenterology, Department of Medicine, College of Medicine, King Saud University, Riyadh 11451, Saudi Arabia
7. Department of Gastroenterology, Yarmouk University, Irbid 21163, Jordan
8. Gastroenterology and Endoscopy, IRCCS Ospedale San Raffaele and Vita-Salute San Raffaele University, 20132 Milan, Italy
9. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, 20132 Milan, Italy
10. Department of Medical Pharmacology, Faculty of Medicine, Cairo University, Cairo 11559, Egypt
11. Immunology and Allergy Department, Medical Research Institute, Alexandria University, Alexandria 5424041, Egypt
12. Internal Medicine Department, Al-Bashir Hospital, Amman 11151, Jordan
13. Gastroenterology Division, Sheikh Khalifa Medical City, Abu Dhabi 51900, United Arab Emirates
14. Department of Medicine, King Abdulaziz University Hospital, Jeddah 21589, Saudi Arabia
15. Integrated Clinical and Research Center for Intestinal Disorders (ICRID), Gastroenterology Division, Endemic Medicine Department, Cairo University, Cairo 3725121, Egypt
16. Gastroenterology and Hepatology, University of Jordan, Amman 11942, Jordan