Funding for this research was provided by:
National Natural Science Foundation of China (51674297)
Natural Science Foundation of Hunan Province (2016JJ2137)
Basic Research Program of Shenzhen (JCYJ20170307140332076)
Article History
Received: 22 December 2017
Accepted: 3 April 2018
First Online: 12 April 2018
Compliance with ethical standards
:
: The authors declare no competing financial interest.