Significance of Colonoscopy in Patients with Intestinal Graft-Versus-Host Disease after Hematopoietic Stem Cell Transplantation - Oomori, S; Takagi, S; Kikuchi, T; Utsunomiya, K; Yokoyama, H; Negoro, K; Tohmiya, Y; Aihara, H; Yamada, M; Takahashi, S; Kameoka, J; Kinouchi, Y; Shimosegawa, T (Endoscopy, 2005)