Funding for this research was provided by:
Iceland Research Foundation grants (120032011, 152679-051)
National Natural Science Foundation of China grant (61073174)
National Natural Science Foundation of China grants (61602195, 61373027)
National Natural Science Foundation of China grants (61402461)
Fundamental Research Funds for HUST (0118210142, 0180210115)
Fundamental Research Funds for HUST (JCYJ20140509174140680)
Article History
Received: 25 April 2016
Accepted: 21 February 2018
First Online: 27 February 2018