1. Division of Nutrition, Physical Activity and Obesity; Centers for Disease Control and Prevention; Atlanta Georgia USA
2. Division of Health and Nutrition Examination Surveys; National Center for Health Statistics, Centers for Disease Control and Prevention; Hyattsville Maryland USA
3. Department of Health Policy and Management, UNC School of Public Health; Chapel Hill North Carolina USA
4. Division of Nutritional Sciences; Nutrition Obesity Research Center, University of Alabama at Birmingham; Birmingham Alabama USA