Funding for this research was provided by:
National Natural Science Foundation of China (11301575)
Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJQN201800537)
Natural Science Foundation of Chongqing (cstc2018jcyjAX0113)
the Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJZD-M201800501)
the Talent Project of Chongqing Normal University (02030307-0054)
Article History
Received: 23 September 2018
Accepted: 11 May 2019
First Online: 15 May 2019