1. Division of Sports Medicine, Department of Orthopaedic Surgery, Duke University Medical Center, Durham, North Carolina, USA.
2. American Sports Medicine Institute, Birmingham, Alabama, USA.
3. Department of Orthopaedic Surgery, Stanford University Medical Center, Palo Alto, California, USA.
4. American Orthopaedic Society for Sports Medicine, Rosemont, Illinois, USA.
5. The Steadman Clinic and Steadman Philippon Research Institute, Vail, Colorado, USA.