Li, Xue-Shi
Pan, Shuxia
Shi, Hong-Bo
Funding for this research was provided by:
National Natural Science Foundation of China (11461040, 11471149)
Natural Science Foundation of Jiangsu Province (BK20151288)
Scientific Research Project of High Education of Gansu Province of China (2016B-080)
Lanzhou City University (LZCU-QN20)
Article History
Received: 24 January 2018
Accepted: 22 March 2018
First Online: 3 April 2018
Competing interests
: The authors declare that they have no competing interests.