1. The Rothman Institute at Thomas Jefferson University, Philadelphia, Pennsylvania, USA
2. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
3. Thomas Jefferson University Hospital, Department of Orthopaedic Surgery, Philadelphia, Pennsylvania, USA
4. Major League Baseball, New York, New York, USA
5. Columbia University Medical Center, Department of Orthopaedic Surgery, New York, New York, USA
6. Hospital for Special Surgery, New York, New York, USA
7. Andrews Sports Medicine & Orthopaedic Center, Birmingham, Alabama, USA