Funding for this research was provided by:
National Natural Science Foundation of China (61502183)
The Scientific Research Funds of Huaqiao University (600005-Z15Y0016)
Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University (ZQN-PY510)
Article History
Received: 5 July 2016
Accepted: 26 December 2018
First Online: 8 January 2019