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Helena J. Hutchins, MPH, BSEd; Centers for Disease Control and Prevention; 4770 Buford Hwy S106-4, Atlanta, GA 30341-3717, USA; telephone: (317) 270-7584. Email: pne8@cdc.gov
Authors have no conflicts of interests to report.
This research was supported in part by an appointment to the Research Participation Program at the Centers for Disease Control and Prevention administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and CDC.