Wang, Fosheng
Wang, Chengqiang
Funding for this research was provided by:
National Natural Science Foundation of China (11701050, 11571244)
Initial Foundation of Mianyang Teachers' College (QD2016A003)
JG Program of Chengdu Normal University (2017JG13)
SCJYT Program of Sichuan Province (18ZB0098)
Article History
Received: 4 March 2018
Accepted: 30 May 2018
First Online: 9 July 2018
Competing interests
: The authors declare that they have no competing interests.