Funding for this research was provided by:
National Natural Science Foundation of China (21633002)
Chongqing Science and Technology Commission (cstc2017shmsA30018)
Foundation of Chongqing University of Arts and Sciences (P2017CH11, 2017RCH02)
Article History
Received: 2 September 2018
Accepted: 15 January 2019
First Online: 25 January 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.