Received: 9 May 2020
Accepted: 9 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: The study was ethically approved by the medical ethics committee of Central South University (identification code: CTXY-150002-7). Written informed consent was obtained from all participants before administering any study procedures.
: Not applicable.
: The authors declare that they have no competing interests.