Williams PA, Cates SC, Blitstein JL, Hersey J, Gabor V, Ball M, Kosa K, Wilson H, Olson S, Singh A. Nutrition-education program improves preschoolers' at-home diet: a group randomized trial. J Acad Nutr Diet. 2014 Jul;114(7):1001-8. doi: 10.1016/j.jand.2014.01.015