1. Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA 16802
2. Department of Biobehavioral Health, The Pennsylvania State University, University Park, PA 16802
3. Jean Mayer USDA Human Nutrition Research Center on Aging, Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA 02111
4. Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802