Funding for this research was provided by:
National Natural Science Foundation of China (81960270)
Received: 6 November 2019
Accepted: 15 May 2020
First Online: 24 May 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Review Board of Ningxia Medical University and General Hospital of Ningxia Medical University. Informed consent for participation was obtained from all subjects.
: Not applicable.
: The authors declare that they have no competing interests.