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Authors
Yang, Ying
Wang, Zengwu
Chen, Zuo
Wang, Xin
Zhang, Linfeng
Li, Suning
Zheng, Congyi
Kang, Yuting
Jiang, Linlin
Zhu, Zhenhui
Gao, Runlin
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Article History
Received: 22 December 2020
Accepted: 3 July 2021
First Online: 13 July 2021
Declarations
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: Written informed consent was required from each participant before data collection. This study (No. 2011BAI11B01) was approved by the ethics committee of Fuwai Hospital, Beijing, China. All procedures were in accordance with the 1964 Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.
