1 Department of Internal Medicine, Gastroenterology Division, Faculty of Medicine, Cairo University, Cairo, Egypt.
2 Department of Internal Medicine, Cardiology, Gastroenterology and Endocrinology, Hospital of the Ministry of Interior and Administration, Szczecin, Poland.
3 Department of Gastroenterology and Hepatology, Medical University of Silesia, Katowice, Poland.
4 Department of Medicine, Division of Digestive Diseases, University of Mississippi Medical Center, Jackson, MS, USA.
5 Department of Internal Medicine, National Hepatology and Tropical Medicine Research Institute (NHTMRI), Cairo, Egypt.