Funding for this research was provided by:
National Natural Science Foundation of China (81673023, 81502068, 81872501)
Beijing Natural Science Foundation of China (7172177)
Nonprofit Central Research Institute Fund of the Chinese Academy of Medical Sciences (2018PT32014)
Received: 30 July 2020
Accepted: 25 October 2020
First Online: 31 October 2020
Ethics approval and consent to participate
: This study was approved by the institutional Review Board of Peking Union Medical College Hospital (S-K832). The need for informed consent was waived because this was a retrospective analysis of data from the hospital database.
: Not applicable.
: The authors declare that they have no competing interests.