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Article History

Received: 10 July 2017

Accepted: 8 December 2017

First Online: 9 January 2018

Ethics approval and consent to participate

: All participants provided informed verbal consent. Approval for conduction of the epidemiology studies was acquired from the institutional review boards at the University of Illinois at Chicago, the Center for Disease Control and Prevention, and the University of North Carolina, Chapel Hill for all study locations.

: No individual’s personal data are within the manuscript.

: All authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.