Funding for this research was provided by:
National Aeronautics and Space Administration (NNX15AT41G)
National Science Foundation (EAR-1331846, EAR-1138611, AGS-1354402, AGS-1445956)
Article History
Received: 19 August 2016
Accepted: 7 October 2016
First Online: 18 October 2016
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.