1. Faculty of Medicine, Tanta University, Tanta, Egypt
2. Faculty of Medicine, Ain-Shams University, Cairo, Egypt
3. Department of Medicine, University of Missouri, Kansas City, MO, USA
4. Faculty of Medicine, Minia University, Minia, Egypt
5. Faculty of Medicine, Islamic University of Gaza, Gaza, Palestine
6. Faculty of Medicine, Alexandria University, Alexandria, Egypt
7. Faculty of Medicine, Al-Azhar University, Cairo, Egypt
8. Department of Medicine, University of Texas, MD Anderson Cancer Center, Houston, TX, USA
9. Department of Cardiology, West Virginia University, Morgantown, WV, USA
10. Department of Internal Medicine, Michigan State University, East Lansing, MI, USA
11. Gastroenterology and Hepatology Section, Baylor College of Medicine, Houston, TX, USA