Funding for this research was provided by:
National Science Foundation (1203005, 1217247)
Article History
Received: 21 October 2016
Accepted: 11 July 2017
First Online: 21 June 2018
Compliance with ethical standards
:
: The authors confirm that they have no conflict of interest with CSSE, including any interest or relationship, financial or otherwise, that might be perceived as influencing an author’s objectivity is considered a potential source of conflict of interest.