Published on in Vol 21 , No 6 (2019) :June
Preprints (earlier versions) of this paper are available at https://preprints.jmir.org/preprint/14158, first published .
1 Department of Nutrition and Food Studies, George Mason University, Fairfax, VA, US
2 University of Florida, UF Health Cancer Center, Gainesville, FL, US
3 Westat, Rockville, MD, US
*all authors contributed equally