Received: 8 February 2021
Accepted: 4 May 2021
First Online: 13 May 2021
: All procedures performed in studies involving human participants were 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. This study was approved by the ethics committee of the First Affiliated Hospital of Chongqing Medical University. Written informed consent was obtained from all of the participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.