1. Center for Injury Research and Policy, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, Ohio;
2. College of Public Health, Kent State University, Kent, Ohio;
3. Division of Sports Medicine, Nationwide Children's Hospital, Columbus, Ohio;
4. Department of Pediatrics, The Ohio State University, College of Medicine, Columbus, Ohio; and
5. Departments of Sport and Internal Medicine, The Ohio State University, College of Medicine, Columbus, Ohio.