1. Department of Family Relations and Applied Nutrition, University of Guelph, Guelph, ON N1G 2W1, Canada.
2. Department of Mathematics and Statistics, University of Guelph, Guelph, ON N1G 2W1, Canada.
3. Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.