Funding for this research was provided by:
National Science Foundation (1347417, 1347482, 1347580, 1347718, and 1500309)
Text and Data Mining valid from 2018-03-12
Received: 25 October 2017
Accepted: 23 January 2018
First Online: 12 March 2018
Ethics approval and consent to participate
: This study was approved by the University of Texas and University of Michigan Institutional Review Boards. Participants signed consent forms which explained the nature of the study and the protections placed on their identities. In the analysis and presentation of this data, pseudonyms were used for all participants.
: The authors declare that they have no competing interests.
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