Received: 19 July 2020
Accepted: 15 March 2021
First Online: 25 March 2021
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the Institutional Review Board (IRB) of Peking University First Hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.As a retrospective study, informed consent was not required.
: Not applicable.
: All the authors declared that they had no conflict of interest.