Funding for this research was provided by:
National Science Foundation (AGS-1123222, AGS-1552301, AGS-1554926, AGS-1433968, AGS-1039593)
Air Force Office of Scientific Research (FA9550-13-1-0095)
Text and Data Mining valid from 2018-03-01
Received: 31 August 2017
Accepted: 9 February 2018
First Online: 1 March 2018
: The authors declare that they have no competing interests.
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