1. Endoscopy Unit, Department of Internal Medicine, College of Medicine, Prince Sattam Bin, Abdulaziz University, PrinceSattam Bin Abdulaziz University Hospital, Al-Kharj 16278, Saudi Arabia
2. Department of Gastroenterology, Prince Sultan Military Medical City, Riyadh 11159, Saudi Arabia
3. Endoscopy Unit, Al-Kharj Military Hospital, Al-Kharj 11494, Saudi Arabia
4. Endoscopy Unit, King Khaled Hospital and Prince Sultan Centre for Health Care, Al-Kharj 11942, Saudi Arabia
5. Department of Family and Community Medicine, College of Medicine, Prince Sattam Bin Abdulaziz University, Al-Kharj 16278, Saudi Arabia