Endoscopic Grading and Sampling of Gastric Precancerous Lesions: A Comprehensive Literature Review oleh Georgios Tziatzios, Dimitrios Ι. Ziogas, Paraskevas Gkolfakis, Vasilios Papadopoulos, Apostolis Papaefthymiou, Nikoletta Mathou, Athanasios Giannakopoulos, Gerasimos Gerasimatos, Konstantina D. Paraskeva, Konstantinos Triantafyllou