Kazuya Okushin, Akira Kado, Kenichiro Enooku, Hidetaka Fujinaga, Kazuhiko Koike, Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
Kazuya Okushin, Kyoji Moriya, Department of Infection Control and Prevention, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
Takeya Tsutsumi, Kazuhiko Ikeuchi, Hiroshi Yotsuyanagi, Division of Infectious Diseases, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo 108-8639, Japan
Kazuhiko Ikeuchi, Kyoji Moriya, Department of Infectious Diseases, The University of Tokyo, Tokyo 113-8655, Japan
Author contributions: Okushin K and Tsutsumi T contributed to selecting references and drafting the manuscript; Ikeuchi K, Kado A, Enooku K, Fujinaga H, Moriya K, and Yotsuyanagi H participated in the critical revision of the manuscript to ensure that the intellectual content achieved a high standard; Koike K participated in selecting the references, drafting, and critically revising the manuscript to ensure that the intellectual content achieved a high standard; all authors have reviewed and approved the final version of the manuscript.
Conflict-of-interest statement: No author has any relevant conflicts of interest.
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: Takeya Tsutsumi, MD, PhD, Associate Professor, Division of Infectious Diseases, Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo, 4-6-1 Shiroganedai, Minato-ku, Tokyo 108-8639, Japan. email@example.com
Telephone: +81-3-34438111 Fax: +81-3-54495427
Received: April 26, 2018
Peer-review started: April 26, 2018
First decision: May 24, 2018
Revised: May 30, 2018
Accepted: June 27, 2018
Article in press: June 27, 2018
Published online: August 28, 2018