1. Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute and
2. Division of Pediatric Cardiology, University of Michigan Medical School, Ann Arbor, Michigan;
3. Centers for Disease Control and Prevention, Atlanta, Georgia;
4. National Center for Fatality Review and Prevention, Michigan Public Health Institute, Okemos, Michigan; and
5. DB Consulting Group, Inc, Silver Spring, Maryland
6. National Institute of Neurologic Disorders and Stroke, National Institutes of Health, Bethesda, Maryland;