Hou, Quanhua
Zhang, Xuan
Li, Bo
Zhang, Xiaoqing
Wang, Wenhui
Funding for this research was provided by:
National Science & Technology Pillar Program during the 12th Five-year Plan Period (2015BAL01B02)
Social Development and Scientific Research Projects in Shaanxi Province (2015SF294)
Special Project of Education Teaching Reform in Central University (jgy16085)
Article History
Received: 13 December 2017
Accepted: 16 March 2018
First Online: 3 April 2018
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest regarding the publication of this paper.