Platelet / spleen ratio for the diagnosis of esophageal varices and the risk of bleeding in patients with liver failure oleh Álvaro José Montiel Jarquín, Arturo Garcia Galicia, Andrés Gámez Herrera, Emma Ixchel González Bravo, Ricardo Adolfo Parker Bosquez, José Alfredo Leon Zamudio, José Álvaro Parra Salazar, María del Socorro Romero Figueroa