The Use of Endoscopic Ultrasound-Guided Fine-Needle Aspiration for Investigation of Submucosal and Extrinsic Masses of the Colon and Rectum - Sasaki, Y; Niwa, Y; Hirooka, Y; Ohmiya, N; Itoh, A; Ando, N; Miyahara, R; Furuta, S; Goto, H (Endoscopy, 2005)