Funding for this research was provided by:
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (XMLX201815)
Beijing Municipal Science & Technology Commission (Z181100001718220)
Article History
Received: 29 June 2020
Revised: 23 October 2020
Accepted: 16 November 2020
First Online: 6 January 2021
Compliance with ethical standards
:
: The scientific guarantor of this publication is Zhi-Jun Zhu.
: The authors report no conflicts of interest.
: The statistical methods employed in this manuscript were reviewed by Shanshan Wu, MD, PhD, from Clinical Epidemiology and EBM Unit, National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China.
: Written informed consent was not required for this study because the article type is a systematic review and meta-analysis.
: Institutional Review Board approval was not required for this study because the article type is a systematic review and meta-analysis.
: • Performed at one institution