Tan, Yuanshun
Tang, Sanyi
Chen, Xiaofeng
Funding for this research was provided by:
National Natural Science Foundation of China (11471201)
Program of Chongqing Innovation Team Project in University (CXTDX201601022)
Natural Science Foundation of Chongqing (cstc2017jcyjAX0082)
Chongqing Municipal Education Commission (KJ1705138)
Article History
Received: 4 December 2017
Accepted: 9 February 2018
First Online: 20 February 2018
Competing interests
: The authors declare that they have no competing interests.