1. The Sports Medicine Center, Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA
2. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
3. Johns Hopkins Center for Injury Research and Policy, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
4. Department of Orthopaedic Surgery, Children’s Hospital Colorado, Aurora, Colorado, USA
5. Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, New York, USA
6. Office of the Commissioner, Major League Baseball, New York, New York, USA