Wang, Haiyan
Liu, Dujin
Pu, Guolin
Funding for this research was provided by:
Sichuan Provincial Department of Education (16ZB0360)
Article History
Received: 22 January 2017
Accepted: 4 October 2017
First Online: 22 October 2017
Compliance with ethical standard
:
: The authors of this submission are stating no conflict of interests with the work presented in this paper.