1. Mayo Clinic Alix School of Medicine, Rochester, Minnesota, USA
2. Department of Orthopaedic Surgery, St. Joseph’s University Medical Center, Paterson, New Jersey, USA
3. Department of Orthopaedics, MedStar Georgetown University Hospital, Washington, DC, USA
4. New Jersey Orthopaedic Institute, Wayne, New Jersey, USA
5. Department of Orthopedics, University of Colorado School of Medicine, Aurora, Colorado, USA