Liver Research Unit. Medica Sur Clinic & Foundation, Mexico City, Mexico.; Address for correspondence: Nahum Méndez-Sánchez Departments of Biomedical Research, Gastroenterology & Liver Unit, Medica Sur Clinic & Foundation, Puente de Piedra 150, Col. Toriello Guerra, Tlalpan 14050, Mexico City, Mexico. Phone: (+525) 55606-6222 ext. 4215; Fax: (+525)55 666-4031;
