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Authors
Fu, Yuan
Sun, Hao
Guo, Zongsheng
Xu, Li
Yang, Xinchun
Wang, Lefeng
Li, Kuibao
Chen, Mulei https://orcid.org/0000-0002-8151-338X
Gao, Yuanfeng
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Article History
Received: 22 June 2020
Accepted: 3 October 2020
First Online: 19 October 2020
Compliance with ethical standards
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: The authors declare that they have no conflict of interest.
: Our study was conducted in accordance with the Declaration of Helsinki and was approved by the Ethics Committees of the Beijing Chaoyang Hospital affiliated to Capital Medical University. All data were anonymous and obtained from electronic medical record system.
: For this type of study, no informed consent is required.
