Funding for this research was provided by:
FP7 People: Marie-Curie Actions (608417)
Directorate for Social, Behavioral and Economic Sciences (1433642)
American Institute for Yemeni Studies (2012)
University of California Office of the President (2014-2015 Dissertation-Year Fellowship)
University of California Center for New Racial Studies (2013-14 Graduate Resear Grant)
Text and Data Mining valid from 2019-03-28
Received: 7 June 2018
Accepted: 8 January 2019
First Online: 28 March 2019
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.