A brief summary of endoscopic classifications in the upper gastrointestinal tract and their clinical relevance Javier Jiménez Sánchez; Pedro Delgado-Guillena; Leticia Moreira; Juan José Martínez Crespo;

Low-grade dysplasia in Barrett's esophagus: A problematic diagnosis Muhannad Sarem; Francisco J. Martínez Cerezo; Maria Lujan Salvia Favieres; Rodolfo Corti;