1. Department of Gastroenterology and Hepatology, Hamad Hospital and Weill Cornell Medical College in Qatar
2. Department of Laboratory Medicine and Pathology, Hematology Section
3. Department of Gastroenterology and Hepatology
4. Medical Research Centre, Hamad Hospital, Doha, Qatar
5. Infections and Immunoepidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD, USA
6. National Liver Institute, Public Health Branch, Shibin Elkom, Menoufia, Egypt