1. Division of Orthopaedic Surgery, City of Hope National Medical Center, Duarte, CA, USA
2. Department of Orthopaedic Surgery, University of California Irvine School of Medicine, Irvine, CA, USA
3. Department of Orthopaedic Surgery, Southern Illinois University School of Medicine, Springfield, IL, USA
4. Department of Orthopaedic Surgery, BG Hospital Murnau, Murnau am Staffelsee, Germany
5. Departments of Orthopaedic Surgery, Medical University of Graz, Graz, Austria
6. The Paley Orthopedic and Spine Institute, St. Mary’s Medical Center, West Palm Beach, FL, USA
7. Department of Orthopaedic Surgery, Saint Louis University School of Medicine, St. Louis, MO, USA
8. Orthopaedic Reconstruction, Aarhus University, Aarhus, Denmark