Endoscopic submucosal dissection for residual/local recurrence of early gastric cancer after endoscopic mucosal resection - Oka, S; Tanaka, S; Kaneko, I; Mouri, R; Hirata, M; Kanao, H; Kawamura, T; Yoshida, S; Yoshihara, M; Chayama, K (Endoscopy, 2006)