Funding for this research was provided by:
National Nature Science Foundation of China (61502006)
the Natural Science Foundation of Anhui Province (1508085QF127)
the Natural Sci- ence Foundation of Anhui Higher Education Institutions of China (KJ2014A015, KJ2015A110)
Natural Science Foundation of Anhui Higher Education Institutions of China (KJ2016A114, KJ2015ZD44)