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Corresponding author: Susan A. Carlson, PhD, Centers for Disease Control and Prevention, Division of Nutrition, Physical Activity, and Obesity, 4770 Buford Hwy NE, MS F-77, Atlanta, GA 30341–3717. E-mail address: scarlson1@cdc.gov
We have no conflicts of interest to report.
The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.
© 2015. Published by Elsevier Inc.