Funding for this research was provided by:
EU FP7 program STREVCOMS (PIRSES-GA-2013-612669)
Alexander von Humboldt-Stiftung
NSF of China (11771063)
Natural Science Foundation of Chongqing (cstc2017jcyjAX0006)
Science and Technology Project of Chongqing Education Committee (KJ KJ1703041)
University Young Core Teacher Foundation of Chongqing (020603011714)
Talent Project of Chongqing Normal University (02030307-00024)
Article History
Received: 9 April 2017
Accepted: 25 January 2018
First Online: 1 March 2018