Kazuya Takahashi, Yuichi Sato, Department of Endoscopy, Niigata University Medical and Dental Hospital, Niigata 951-8510, Japan
Kazuya Takahashi, Junji Kohisa, Division of Gastroenterology and Hepatology, Sado General Hospital, Niigata 952-1209, Japan
Kazuya Takahashi, Hiroki Sato, Kenichi Mizuno, Satoru Hashimoto, Shuji Terai, Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8510, Japan
Jun Watanabe, Division of Gastroenterology and Hepatology, Nagaoka Red Cross Hospital, Niigata 940-0095, Japan
Author contributions: Takahashi K designed this study, collected and analyzed the data and drafted the manuscript; Terai S gave final approval of the version to be published; Sato Y revised the manuscript; Kohisa J, Watanabe J, Sato H, Mizuno K and Hashimoto S took part in this study as endoscopic operators or assistants.
Institutional review board statement: The study protocol was approved by the Sado General Hospital Institutional Ethics Committee.
Clinical trial registration statement: This study is registered at UMIN clinical Trial Registry. The registration identification number is UMIN000022006.
Informed consent statement: All study participants provided informed written consent prior to study enrollment.
Conflict-of-interest statement: None declared.
Data sharing statement: No additional data are available.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Kazuya Takahashi, MD, PhD, Division of Gastroenterology and Hepatology, Niigata University Medical and Dental Hospital, 757-1, Asahimachidori, Chuo-ku, Niigata-city, Niigata 951-8510, Japan. firstname.lastname@example.org
Telephone: +81-25-2232207 Fax: +81-25-2230776
Received: May 29, 2016
Peer-review started: May 30, 2016
First decision: July 20, 2016
Revised: August 1, 2016
Accepted: September 13, 2016
Article in press: September 18, 2016
Published online: November 16, 2016