Statistical analysis conducted
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Supplementary materials: Figure 1 is available at www.jandonline.org.
STATEMENT OF POTENTIAL CONFLICT OF INTEREST No potential conflict of interest was reported by the authors.
FUNDING/SUPPORT This study was conducted as part of the Duke-UNC USDA Center for Behavioral Economics and Healthy Food Choice Research (BECR). The BECR Center was funded by grant 59-5000-4-0062 from the US Department of Agriculture. The views expressed are those of the authors and do not represent those of the US Department of Agriculture, its Economic Research Service or Food and Nutrition Service.