Funding for this research was provided by:
National Natural Science Foundation of China (61502063, 61502004)
Chongqing Science and Technology Commission (cstc2018jcyjAX0057)
Chongqing Municipal Education Commission (KJQN201800814)
Chongqing Municipal Human Resources and Social Security Bureau (2017YBGL142)
Article History
Received: 31 July 2019
Accepted: 29 October 2019
First Online: 20 November 2019