Funding for this research was provided by:
College Scientific Research Project of Inner Mongolia Autonomous Region (NJZY18159)
Science and Technology Innovation Guide Project of Inner Mongolia Autonomous Region (KCBJ2018028)
Higher Education Teaching Reform Research Project of National Civil Affairs (15085)
Article History
First Online: 15 March 2019
Compliance with ethical standards
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest.