Endoscopic submucosal dissection for the treatment of early esophageal and gastric cancer - initial experience of a western center - Chaves, Dalton Marques; Maluf Filho, Fauze; Moura, Eduardo G. H. de; Santos, Marcos Eduardo Lera dos; Arrais, Livia Ronise Garcia; Kawaguti, Fabio; Sakai, Paulo; Sakai, Paulo (Clinics, 2010)