Funding for this research was provided by:
National Natural Science Foundation of China (81501990)
Received: 14 November 2019
Accepted: 19 August 2020
First Online: 24 August 2020
Ethics approval and consent to participate
: All analyses were based on previously published studies, and hence no ethical approval and patient consent were required.
: Not applicable.
: The authors declare that they have no competing interests.