Received: 17 March 2020
Accepted: 16 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: All subjects have given their written informed consent and the study was approved by the ethics committee of the Second Affiliated Hospital of Anhui Medical University. It was conducted according to the standards of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.