1. Vitamin Metabolism Laboratory, Tufts University, Boston, MA
2. Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA
3. Obesity Metabolism Laboratory, Tufts University, Boston, MA
4. Boston University School of Medicine, Boston, MA
5. Safra Children's Hospital, Tel-Aviv University, Tel-Aviv, Israel
6. Nutritional Epidemiology Program, Jean Mayer USDA Human Nutrition Research Center, Tufts University, Boston, MA