683 Views | 643 Downloads
Correspondence: Jeremy Hess; Email: jhess@emory.edu; Tel.: +1-404-251-8851; Fax: +1-404-688-6351
Authors' Contributions: Gino D. Marinucci, Jeremy J. Hess, and George Luber conceived of the manuscript, and all authors participated in drafting and revising the manuscript.
Acknowledgments: The authors gratefully acknowledge internal reviewers at the Centers for Disease Control and Prevention for their assistance in strengthening the manuscript.
Disclosures: The authors declare no conflict of interest.
© 2014 by the authors; licensee MDPI, Basel, Switzerland.