Received: 22 April 2021
Accepted: 15 June 2021
First Online: 2 July 2021
: All analyses of human data conducted in this study were approved by the Ethics Committee Board of the Peking University First Hospital and in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was waived by the Ethics Committee Board of the Peking University First Hospital that approved the study because of the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.