Funding for this research was provided by:
Philosophy and Social Sciences Fund Project of Jiangsu Provincial Department of Education (2018SJA0960)
Received: 3 May 2020
Accepted: 29 October 2020
First Online: 7 November 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Ethics Committee of Xuzhou Medical University (XZMU20180068). All participants gave written consent to participate.
: All participants gave written consent for publication of their data.
: The authors declare that they have no competing interests.