1. Nutritional Epidemiology Program, U.S. Department of Agriculture, Jean Mayer Human Nutrition Research Center on Aging, Tufts University, Boston, MA, U.S.A.
2. Energy Metabolism Laboratory, U.S. Department of Agriculture, Jean Mayer Human Nutrition Research Center on Aging, Tufts University, Boston, MA, U.S.A.
3. John Hancock Research Center on Physical Activity, Nutrition, and Obesity Prevention, Tufts University, Friedman School of Nutrition Science and Policy, Boston, MA, U.S.A.