Funding for this research was provided by:
Natural Science Foundation of Hubei Province (2014CFB913)
the National Science Foundation (IIS-1115417)
Article History
Received: 1 March 2016
Accepted: 10 February 2017
First Online: 21 February 2017
Compliance with ethical standards
:
: We declare that we have no conflicts of interest to this work. The manuscript has been approved by all authors for publication.