1. Internal Medicine and Clinical Immunology Department, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon; Internal Medicine and Clinical Immunology Department, Lebanese Hospital Geitaoui, Beirut, Lebanon
2. Internal Medicine and Clinical Immunology Department, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
3. Anatomo Pathology Department, Lebanese Hospital Geitaoui, Beirut, Lebanon; Anatomo Pathology Department, Faculty of Medical Sciences, Lebanese University, Beirut, Lebanon
4. Gastroenterology Department, Lebanese Hospital Geitaoui, Beirut, Lebanon