Funding for this research was provided by:
National Natural Science Foundation of China (81560046)
Guangxi Natural Science Foundation (2016GXNSFAA380002)
Scientific Project of Guangxi Higher Education (KY2015ZD028)
Science Research and Technology Development Project of Qingxiu District of Nanning (2016058)
Lisheng Health Foundation pilotage fund of Peking (LHJJ20158126)