Department of Food Science and Human Nutrition, University of Illinois, 905S. Goodwin Ave., Urbana, IL 61801, USA. Electronic address: ericlien@comcast.net. Department of Agricultural Food and Nutritional Science, 4-002G Li Ka Shing Center for Health Research Innovation, University of Alberta, Edmonton, AB, Canada T6G 2E1. Retina Foundation of the Southwest, 9600 North. Central Expressway, Dallas, TX 75231, USA.