1 Gastroenterology and Hepatology unit, Internal Medicine Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt.
2 Internal Medicine Department, Belbeis Central Hospital, Ministry of Health, Belbeis, Egypt.
3 Environmental & Occupational Medicine Department, Faculty of Medicine, Zagazig University, Community, Egypt.
4 Gastroenterology and Hepatology unit, Internal Medicine Department, Faculty of Medicine, Zagazig University, Zagazig, Egypt. salemyousefmohamed@gmail.com.