Endoscopy vs surgery in the treatment of early gastric cancer: Systematic review - Kondo, André; Moura, Eduardo Guimarães Hourneaux de; Bernardo, Wanderley Marques; Yagi, Osmar Kenji; Moura, Diogo Turiani Hourneaux de; Moura, Eduardo Turiani Hourneaux de; Bravo, José Gonçalves Pereira; Yamazaki, Kendi; Sakai, Paulo (World Journal of Gastroenterology, 2015)