Funding for this research was provided by:
National Natural Science Foundation of China (No. 81660347)
Guizhou Provincial Science and Technology Plan Project ( 1154)
Youth Science and Technology Talents Growth Project of Guizhou Provincial Department of Education (148)
Doctoral Fund of Guizhou Medical University ( 002)
Science and Technology Fund Project of Guizhou Provincial Health and Family Planning Commission (gzwjkj2017-1-009)
Received: 6 March 2019
Accepted: 5 November 2019
First Online: 14 November 2019
Ethics approval and consent to participate
: All materials used in this study were approved for use by the Institutional Review Board, and all methods/experiments were conducted in accordance with the guidelines approved by the Ethics Committee of Guizhou Medical University, China.
: Not applicable.
: The authors declare that they have no competing interests.