Funding for this research was provided by:
Centers for Disease Control and Prevention (Cooperative Agreement 1U38OT000161)
Received: 11 April 2017
Accepted: 15 November 2017
First Online: 21 November 2017
Ethics approval and consent to participate
: This project received an exemption from the Institutional Review Board at the University of Illinois at Chicago.
: Not applicable
: The authors declare that they have no competing interests.
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