Funding for this research was provided by:
National Natural Science Foundation of China (11671176)
Natural Science Foundation of Fujian Province (2018J0100)
strat-up fund of Huaqiao University (Z16J0039)
China Postdoctoral Science Foundation (2014M551873)
Article History
Received: 14 February 2019
Accepted: 14 June 2019
First Online: 24 July 2019
Competing interests
: The authors declare that they have no competing interests.