Funding for this research was provided by:
National Natural Science Foundation of China (81671431, 81170544)
Received: 23 June 2020
Accepted: 4 November 2020
First Online: 18 March 2021
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Peking University People’s.Hospital. Administrative permissions were required to access and use the medical records described in our study by Scientific Research Center of the Peking University People’s Hospital. As this study is a retrospective study, there is no need for consent to participate to be obtained.
: Not applicable.
: The authors declare that they have no competing interests.