Authors: Felix I Tellez-Avila; Francisco Sanchez-Avila; Mauricio García-Saenz-de-Sicilia; Norberto C Chavez-Tapia; Ada M Franco-Guzman; Gustavo Lopez-Arce; Eduardo Cerda-Contreras; Misael Uribe Journal: World J Gastroenterol Date: 2008-08-14 Impact factor: 5.742