1. Center for Food and Nutrition Policy, Virginia Polytechnic Institute and State University, 1101 Vermont Avenue, NW, Suite 710, Washington, DC, 20005-3521, USA
2. Center for Food and Nutrition Policy, Virginia Polytechnic Institute and State University, , Alexandria, VA, 22314, USA
3. Formerly Georgetown Public Policy Institute, Georgetown University, 3600 N Street, NW, Suite 200, Washington, DC, 20007, USA
4. Georgetown University Medical Center, 4000 Reservoir Road, NW, Washington, DC, 20007, USA