3Department of Endoscopy and Endoscopic Surgery, Gunma University Hospital, 371-0044, Gunma, Japan, E-mail: mkusano@showa.gunma-u.ac.jp
*Corresponding Author:
Motoyasu Kusano, MD, PhD, Department of Endoscopy and Endoscopic Surgery, Gunma University Hospital, 371-0044, Gunma, Japan, Tel: 81-027-220-8137