[1] Cairo Univ, Fac Med, Endem Med Dept, Cairo, Egypt
[2] Cairo Univ, Fac Med, Hepatol Unit, Cairo, Egypt
[3] Egyptian Liver Res Inst & Hosp, Mansoura, Egypt
[4] Natl Hepatol & Trop Med Res Inst, Cairo, Egypt
[5] Gilead Sci Inc, Foster City, CA 94404 USA