Funding for this research was provided by:
National Science Foundation of Hebei Province (2009001199)
Article History
Received: 7 May 2019
Accepted: 20 April 2020
First Online: 30 April 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Fourth Affiliated Hospital of Hebei Medical University. Written informed consent was obtained from all participants.
: Not Applicable.
: The authors declare no competing interests.