Funding for this research was provided by:
National Natural Science Foundation of China (81974511)
Received: 25 March 2020
Accepted: 24 July 2020
First Online: 6 August 2020
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of the Third Xiangya Hospital of Central South University and registered with the Chinese Clinical Trial Registry (ExternalRef removed, registration number: ChiCTR2000030464). Due to the nature of this retrospective study that used anonymized data, the requirement of obtaining informed consents from the patients was waived by the Institutional Review Board.
: Not applicable.
: The authors declare that they have no conflicts of interest.