1Department of Gastroenterology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
2Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
© Copyright 2019. Korean Association for the Study of Intestinal Diseases. All rights reserved.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
FINANCIAL SUPPORT
This work was supported by specialized scientific research fund project for healthcare industry (201002020) and Teaching Quality Project of Peking Union Medical College (2017zlgc0110).
CONFLICT OF INTEREST
No potential conflict of interest relevant to this article was reported.
AUTHOR CONTRIBUTION
Conceptualization: Liu S and Li J. Methodology: formal analysis: funding acquisition: Qian JM and Li J. Project administration: Qian JM. Visualization: You Y. Writing-original draft: Liu S. Writing-review and editing: Ruan GC, You Y, and Li J. Approval of final manuscript: all authors.