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Mumtaz A Niazi, Ashaur Azhar, Kashif Tufail, Eyob L Feyssa, Stephen F Penny, Marlene McGregory, Victor Araya, Jorge A Ortiz 
World J Hepatol 2(4):162-166. Published online Apr 27, 2010. doi: 10.4254/wjh.v2.i4.162
Eric López-Méndez, Daniel Zamora-Valdés, Mariana Díaz-Zamudio, Oscar F Fernández-Díaz, Lourdes Ávila 
World J Hepatol 2(4):167-170. Published online Apr 27, 2010. doi: 10.4254/wjh.v2.i4.167