1. Hospital for Special Surgery, New York, NY, USA
2. Weill Cornell Medical College, New York, NY, USA
3. University of California, San Francisco, CA, USA
4. Washington University Medical Center, St Louis, MO, USA
5. Columbia University Medical Center, New York, NY, USA
6. The Spine Hospital at NewYork-Presbyterian/Allen, New York, NY, USA
7. FOCOS Orthopedic Hospital, Pantang West, Ghana
8. New York University Langone Medical Center, New York, NY, USA
9. University of Virginia, Charlottesville, VA, USA
10. University of California–San Diego, CA, USA
11. Nagoya City University, Nagoya, Japan
12. University of California, Davis, CA, USA