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Authors
Guo, Run-Qi
Li, Yuan-Ming
Li, Xiao-Guang
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Funding
Funding for this research was provided by:
Scientific Research Starting Foundation for PhD/MD (BJ-2019-135)
Scientific Research Foundation for Central Health Care (2020YB10)
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Article History
Received: 13 February 2021
Accepted: 27 April 2021
First Online: 24 June 2021
Declarations
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: The authors declare that they have no conflict of interest.
: All the included studies mentioned the Approval of Institutional Review Board. This study was a systematic review and meta-analysis. Ethics committee approval was not necessary because all data were carefully extracted from existing literature, and this article did not involve handling of individual patient data. In addition, neither patients nor the public were involved in the design and planning of the study.
: For this type of study, formal consent is not required.
