Kazuhiro Kikuta, Atsushi Masamune, Tooru Shimosegawa, Division of Gastroenterology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan
Author contributions: Kikuta K and Masamune A contributed equally to this work; Kikuta K, Masamune A and Shimosegawa T designed the study; Kikuta K, Masamune A and Shimosegawa T conducted the research; Kikuta K and Masamune A analyzed the data; and Kikuta K, Masamune A and Shimosegawa T wrote the paper.
Supported by Grants from the Smoking Research Foundation (to Masamune A); the Research Committee on Intractable Pancreatic Diseases, the Ministry of Health, Labour and Welfare of Japan (Principal investigators: Shimosegawa T and Takeyama Yoshifumi).
Conflict-of-interest: The authors declare no conflict 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: Atsushi Masamune, MD, PhD, Associate Professor, Division of Gastroenterology, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, Sendai 980-8574, Japan. firstname.lastname@example.org
Telephone: +81-22-7177172 Fax: +81-22-7177177
Received: December 26, 2014
Peer-review started: December 27, 2014
First decision: February 10, 2015
Revised: February 23, 2015
Accepted: April 28, 2015
Article in press: April 28, 2015
Published online: June 28, 2015