Funding for this research was provided by:
National Natural Science Foundation of China (61703291)
Applied Basic Research Program of Science and Technology Department of Sichuan Province, China (2006JY0085)
Article History
Received: 19 January 2019
Accepted: 14 June 2019
First Online: 22 June 2019
Compliance with ethical standards
:
: No potential conflict of interest was reported by the authors.