1. Icahn School of Medicine at Mount Sinai, New York, New York, USA
2. Faculty of Medicine, October 6 University, Giza, Egypt
3. Faculty of Medicine, Menoufia University, Menoufia, Egypt
4. Department of Gastroenterology and Hepatology, University of Missouri – Columbia, Columbia, Missouri, USA
5. School of Medicine, West Virginia University, Morgantown, West Virginia, USA
6. Maimonides Medical Center, Brooklyn, New York, USA
7. Division of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, Indiana, USA
8. Faculty of Medicine, Helwan University, Cairo, Egypt
9. Honorary Professor of Medicine, University of Jordan, Amman, Jordan