Funding for this research was provided by:
Gulf Research Program (200000641)
Texas Census Research Data Center
Received: 15 August 2016
Accepted: 30 January 2018
First Online: 7 February 2018
Ethics approval and consent to participate
: This research was reviewed by the Texas A&M University Institutional Review Board and was determined to be exempt as it relies on publically available data (IRB2015-0811 M).
: The authors declare that they have no competing interests.
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