[1] Natl Hepatol & Trop Med Res Inst, Dept Gastroenterol, Cairo 11796, Egypt
[2] South Valley Univ, Qena Fac Med, Dept Internal Med, Div Gastroenterol & Hepatol, Qena 83523, Egypt
[3] Assiut Univ, Dept Trop Med & Gastroenterol, Assiut 71515, Egypt
[4] Al Azhar Univ, Dept Hepatogastroenterol & Infect Dis, Cairo 11615, Egypt
[5] Alexandria Hepatol, GIT & Fever Hosp, Dept Gastroenterol & Endoscopy, Alexandria 21544, Egypt
[6] Mil Med Acad, Maadi Armed Forces Med Complex, Dept Gastroenterol & Hepatol, Cairo 11711, Egypt
[7] Al Azhar Univ, Dept Hepatogastroenterol & Infect Dis, Dumyat 34711, Egypt
[8] Ain Shams Univ, Dept Trop Med, Cairo 11566, Egypt
[9] Assiut Univ, Dept Internal Med, Div Gastroenterol & Hepatol, Assiut 71515, Egypt
[10] Cairo Univ, Kasr Alaini Fac Med, Dept Internal Med, Div Gastrointestinal Endoscopy, Giza 12613, Egypt
[11] Nasser Inst Res & Treatment, Dept Gastroenterol & Hepatol, Cairo 11796, Egypt
[12] Menoufia Univ, Natl Liver Inst, Dept Hepatol & Gastroenterol, Menoufia 13829, Egypt
[13] Misr Univ Sci & Technol, Suad Kafafy Univ Hosp, Dept Gen Med, Cairo 12566, Egypt
[14] Univ Sheffield, Sheffield Teaching Hosp, Dept Endoscopy, Sheffield S5 7AU, England
[15] Al Azhar Univ, Dept Internal Med, Div Gastroenterol & Hepatol, Cairo 11615, Egypt