Funding for this research was provided by:
First-Class Discipline Construction Founded Project of NingXia Medical University and the School of Cincical Medicine (NXYLXK2017B07)
Article History
Received: 5 December 2019
Accepted: 18 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.