Funding for this research was provided by:
National Natural Science Foundation of China (81803056)
Received: 31 March 2020
Accepted: 29 July 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of West China Hospital with the exemption for patient consent, because it is a retrospective study which would not bring extra risk to patient healthy and human rights (#2019–954).
: Not applicable.
: The authors declare that they have no competing interests.