Tian-Lian Yan, Jian-Guo Gao, Jing-Hua Wang, Dan Chen, Chao Lu, Cheng-Fu Xu, Department of Gastroenterology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, Zhejiang Province, China
Author contributions: Yan TL and Gao JG contributed equally to this work; Xu CF, Yan TL, and Lu C designed the research; Yan TL, Gao JG, and Chen D performed the research; Wang JH analyzed the data; Yan TL and Xu CF drafted and revised the manuscript. All authors approved the final draft of this manuscript for submission.
Supported by the National Natural Science Foundation of China, No. 81600447.
Institutional review board statement: This study was reviewed and approved by the Clinical Research Ethics Committee of the First Affiliated Hospital, Zhejiang University School of Medicine.
Informed consent statement: Because of the retrospective and anonymous nature of this study, the need for informed consent was exempted by the institutional review board.
Conflict-of-interest statement: All of the authors declare that they have no conflicts of interest to disclose.
Data sharing statement: No additional data are available.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (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/
Corresponding author: Cheng-Fu Xu, MD, Doctor, Department of Gastroenterology, The First Affiliated Hospital, Zhejiang University School of Medicine, No. 79 Qingchun Road, Hangzhou 310003, Zhejiang Province, China. email@example.com
Received: April 24, 2020
Peer-review started: April 24, 2020
First decision: June 13, 2020
Revised: July 18, 2020
Accepted: July 30, 2020
Article in press: July 30, 2020
Published online: August 28, 2020