Niu, Gengfeng
Sun, Lijun
Liu, Qingqi
Chai, Huanyou
Sun, Xiaojun
Zhou, Zongkui
Funding for this research was provided by:
Postdoctoral Research Foundation of China (2018M631131)
Social Science Fund Project of Shaanxi Province (2018Q05)
MOE (Ministry of Education in China) Project of Humanities and Social Sciences (19YJC190019)
Article History
First Online: 26 April 2019
Compliance with Ethical Standards
: All ethical guidelines for human subjects’ research were followed.
: All authors declare they have no conflicts of interest.