1. Faculty of Medicine, Tanta University, Tanta, Egypt
2. Department of Radiology, King Edward Medical University, Lahore, Pakistan
3. Department of Surgery, King Edward Medical University, Lahore, Pakistan
4. Faculty of Medicine, Ain-Shams University, Cairo, Egypt
5. Faculty of Medicine, Cairo University, Cairo, Egypt
6. Department of Medicine, Ochsner Rush Medical Center, Meridian, MS, USA
7. Department of Gastroenterology, Hepatology & Nutrition, University of Texas, Houston, TX, USA
8. Section of Gastroenterology and Hepatology, Department of Medicine, Baylor College of Medicine, Houston, TX, USA
9. Division of Transplant and Hepatobiliary Surgery, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA