Funding for this research was provided by:
National Natural Science Foundation of China (41801324)
Natural Science Foundation of Fujian Province (2016J0129)
Department of Education, Fujian Province (JAT160070)
Article History
Received: 21 December 2018
Revised: 12 March 2019
Accepted: 9 May 2019
First Online: 30 May 2019