Zhu, Yangpeng
Li, Peng http://orcid.org/0000-0002-7679-4543
Funding for this research was provided by:
Science and Technology Department Research Plan of Shaanxi province (2016GY-106)
Social Science Foundation of Shaanxi province (2015R026)
Education Department Research Plan of Shaanxi province (15JZ047)
Article History
Received: 19 July 2017
Accepted: 4 June 2018
First Online: 21 June 2018
Compliance with ethical standards
:
: The authors declare that there are no conflicts of interest regarding the publication of this paper.