Funding for this research was provided by:
Natural Science Foundation of Fujian Province (2015J01589)
Science Foundation for the Education Department of Fujian Province (JAT160386)
Science Foundation of Minjiang University under (MYK15004)
Science Foundation of Minjiang University (Mjyp201608)
Article History
Received: 29 July 2017
Accepted: 7 February 2018
First Online: 17 February 2018
Competing interests
: The authors declare that they have no competing interests.