1. Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
2. Sports Medicine Biodynamics Center and Human Performance Laboratory, Cincinnati, Ohio
3. Rocky Mountain University of Health Professions, Provo, Utah
4. Department of Kinesiology and Health Promotion, University of Kentucky, Lexington, Kentucky
5. Center for Epidemiology and Biostatistics, Cincinnati, Ohio
6. Department of Pediatrics, Orthopaedic Surgery, College of Medicine, and the Departments of Biomedical Engineering and Rehabilitation Sciences, University of Cincinnati, Cincinnati, Ohio