New Classification of the Infiltration Degree of Submucosal-Invaded Carcinomas, and its Clinical Usefulness - Otani, Y.; Kobayashi, K.; Yokoyama, K.; Mitomi, H.; Saigenji, K.; Katsumata, T.; Sada, M.; Igarashi, M. (Nippon Daicho Komonbyo Gakkai Zasshi, 2001)