Submucosal injection, for endoscopic mucosal resection, of photocrosslinkable chitosan hydrogel in DMEM/F12 medium - Ishizuka, T; Hayashi, T; Ishihara, M; Yoshizumi, Y; Aiko, S; Nakamura, S; Yura, H; Kanatani, Y; Nogami, Y; Maehara, T (Endoscopy, 2007)