1. Kantonspital Baselland, Liestal, Switzerland
2. Hospital for Special Surgery, New York, NY, USA
3. Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, IA, USA
4. Washington University School of Medicine, St. Louis, MO, USA
5. Department of Orthopedic Surgery, University of Colorado School of Medicine, Aurora, CO, USA
6. University of Washington, Seattle, WA, USA
7. Cedars-Sinai Medical Center, Los Angeles, CA, USA
8. Mercy Medical Center, Baltimore, MD, USA
9. New York University Grossman School of Medicine, New York, NY, USA
10. Johns Hopkins School of Medicine, Baltimore, MD, USA
11. Georgetown School of Medicine, Washington, DC, USA