Received: 17 June 2021
Accepted: 27 January 2022
First Online: 15 February 2022
: All methods performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 2013 Helsinki Declaration and its later amendments or comparable ethical standards.The Biomedical Ethics Review Committee of Peking University approved CFPS, and all participants were required to provide written informed consent. The ethical approval number was IRB00001052-14010.
: Not applicable.
: The authors declare that they have no competing interests.