Funding for this research was provided by:
National Natural Science Foundation of China (No. 31772222, No. 31371992)
Natural Science Foundation of Chongqing (cstc2018jcyjAX0204)
Article History
Received: 30 August 2018
Revised: 10 December 2018
Accepted: 14 December 2018
First Online: 7 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.