1. Department of Tropical Medicine and Gastroenterology, Faculty of Medicine, Assiut University, Assiut, Egypt
2. Department of Tropical Medicine and Gastroenterology, Faculty of Medicine, Sohag University, Sohag, Egypt
3. Department of Internal Medicine, Faculty of Medicine, Sohag University, Sohag, Egypt
4. Department of Medical Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut, Egypt
5. Department of Internal Medicine, University of Cincinnati College of Medicine, Cincinnati, OH, USA
6. Department of Clinical Pathology, Faculty of Medicine, Assiut University, Assiut, Egypt