Funding
This work was supported by Guangxi Natural Science Foundation (#2017GXNSFBA198005); Liuzhou City Science and technology research projects (#2016J03051, #2018BJ10303, #2019AF1060); Department of Health of Guangxi Zhuang Autonomous Region Self-Raised Funds Project (Z2016167, Z20170895). The funders played no role in the design, conduct, or reporting of this study.