Location, morphology and invasiveness of lateral spreading tumors in the colorectum differ between two large cohorts from an eastern and western country Carlos Guarner-Argente; Hiroaki Ikematsu; Shozo Osera; Maria Fraile; Berta Ibañez; Carlos Marra-López; Carla Jerusalén-Gargallo; Pedro A. Alonso Aguirre; David Martinez-Ares; Santiago Soto; Felipe Ramos Zabala; Marco Antonio Alvarez-Gonzalez; Joaquin Rodriguez Sánchez; Fernando Múgica; Oscar Nogales Rincon; Alberto Herreros de Tejada; Eduardo Redondo-Cerezo; Juan Martínez-Cara; Leopoldo López-Rosés; Manuel Rodriguez-Tellez; Orlando Garcia-Bosch; Joaquín de la Peña; María Pellisé; Liseth Rivero-Sanchez; Esteve Saperas; Francisco Pérez-Roldán; Bartolome Lopez Viedma; Jesús M. González-Santiago; Alberto Álvarez Delgado; Carol Cobian; Remedios Pardeiro; Eduardo Valdivielso Cortázar; Juan Colan-Hernandez; Jordi Gordillo; Kazuhiro Kaneko; Eduardo Albéniz;