Qu, Wei
Jiang, Ling
Hou, Guanhua
Article History
Received: 7 December 2020
Accepted: 17 February 2021
First Online: 2 March 2021
Ethics approval and consent to participate
: Written informed consent was obtained from all participants, and this study was permitted by the Ethics Committee of Weihai Municipal Hospital.
: Not applicable
: The authors declare that they have no competing interests.