1. Department of Pediatrics, University of Colorado School of Medicine, Denver, Colorado;
2. Division of Epidemiology and Community Health, University of Minnesota School of Public Health, Minneapolis, Minnesota;
3. Office of Disease Prevention and Health Promotion, Department of Health and Human Services, Rockville, Maryland;
4. Department of Pediatrics, Baylor College of Medicine, Houston, Texas;
5. PS duPont Elementary School, Wilmington, Delaware;
6. Department of Pediatrics, University of California, Davis, Sacramento, California