Tian-Jiao Guo, Jin-Yu Qin, Lin-Lin Zhu, Jin Wang, Jin-Lin Yang, Yi-Ping Wang, Gastroenterology Department of West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
Author contributions: Qin JY, Zhu LL and Wang J collected the data; Guo TJ analyzed and drafted the manuscript; Wang YP provided analytical oversight; Yang JL designed the study and edited the manuscript; all authors have read and approved the final version to be published.
Supported by Science and Technology Department of Sichuan Provincefor Scientific Rearch, No. 2015SZ0123.
Institutional review board statement: This study was reviewed and approved by the Ethics Committee of West China Hospital of Sichuan University.
Informed consent statement: Patients were not required to give informed consent to the study because the analysis used anonymous clinical data that were obtained after each patient agreed to treatment by written consent.
Conflict-of-interest statement: We have no financial relationships to disclose.
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: Jin-Lin Yang, MD, Gastroenterology Department of West China Hospital, Sichuan University, No. 37 GuoXue Xiang, Chengdu 610041, Sichuan Province, China. email@example.com
Telephone: +86-28-85423387 Fax: +86-28-85423387
Received: May 14, 2015
Peer-review started: May 15, 2015
First decision: July 10, 2015
Revised: July 28, 2015
Accepted: October 12, 2015
Article in press: October 13, 2015
Published online: December 21, 2015