Funding for this research was provided by:
National Natural Science Foundation of China (81600196)
Received: 15 October 2020
Accepted: 26 December 2020
First Online: 8 January 2021
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Beijing Friendship Hospital. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institution and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no competing interests.