Xie, Wei
Li, Ruibing
He, Mianwang
Cui, Fang
Sun, Tingting
Xiong, Jianmei
Zhao, Dengfa
Na, Weinan
Liu, Ruozhuo
Yu, Shengyuan
Funding for this research was provided by:
National Natural Science Foundation of China (81671077, 81771180)
Natural Science Foundation of Beijing Municipality (Z170002)
Hainan Provincial Department of Health (2016YW20)
Natural Science Foundation of Beijing Municipality (15BJZ49)
Article History
Received: 5 November 2019
Accepted: 9 January 2020
First Online: 14 January 2020
Ethics approval and consent to participate
: The ethics committee of the Chinese PLA General Hospital approved this study. All respondents were informed of the purpose of the study. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.