P.03.23 PRELIMINARY RESULTS OF "MENTOR-ASSISTED" ENDOSCOPIC SUBMUCOSAL DISSECTION (ESD) TRAINING IN AN EUROPEAN CENTER: LEARNING CURVE AND CLINICAL OUTCOMES. Issue 2 (15th March 2018) - Campanale, M.; Hamanaka, J.; Spada, C.; Greco, S.; Petruzziello, L.; Costamagna, G.