1. Division of Nutrition, Physical Activity, and Obesity, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
2. Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
3. US Public Health Service Commissioned Corps, Rockville, MD 20852, USA
4. Oak Ridge Institute for Science and Education, Oak Ridge, TN 37830, USA