Funding for this research was provided by:
National Natural Science Foundation of China (81672796)
Received: 24 December 2019
Accepted: 9 June 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: This study was approved by the Jining Medical University Institutional Review Board.
: All authors are aware and agree to the content of the paper and their authorships.
: The authors declare that they have no competing interests.