Preoperative Evaluation of Submucosal Invasive Colorectal Cancer Using a 15-MHz Ultrasound Miniprobe - Harada, N.; Hamada, S.; Kubo, H.; Oda, S.; Chijiiwa, Y.; Kabemura, T.; Maruoka, A.; Akahoshi, K.; Yao, T.; Nawata, H. (Endoscopy, 2001)