Indications for the use of endoscopic mucosal resection for early gastric cancer in Japan: a comparative study with endoscopic submucosal dissection - Nakamoto, S.; Sakai, Y.; Kasanuki, J.; Kondo, F.; Ooka, Y.; Kato, K.; Arai, M.; Suzuki, T.; Matsumura, T.; Bekku, D.; Ito, K.; Tanaka, T.; Yokosuka, O. (Endoscopy, 2009)