1. Internal Medicine, Icahn School of Medicine at Mount Sinai, New York City Health and Hospitals, Queens Hospital Center, New York, New York, USA
2. Faculty of Medicine, October 6 University, Giza, Egypt
3. Department of Internal Medicine, University of Missouri Kansas City, Kansas City, Missouri, USA
4. Department of Radiology, Mayo Clinic Rochester, Rochester, Minnesota, USA
5. Department of Gastroenterology, Mayo Clinic, Rochester, Minnesota, USA
6. Department of Medicine, Maimonides Medical Center, New York, New York, USA
7. Faculty of Medicine, Menoufia University, Menoufia, Egypt
8. New York City Health and Hospitals, Metropolitan Hospital, Manhattan, New York, USA
9. Ahmed Maher Teaching Hospital, Cairo, Egypt
10. Department of Medicine, University at Buffalo, Buffalo, New York, USA
11. Endemic Medicine Department, Faculty of Medicine, Helwan University, Cairo, Egypt