Article History
Received: 6 January 2020
Accepted: 26 May 2020
First Online: 17 June 2020
Ethics approval and consent to participate
: I confirm that I have read the Editorial Policy pages. This study was conducted with approval from the Ethics Committee of the Affiliated Hospital of Xuzhou Medical University. This study was conducted in accordance with the declaration of Helsinki. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.