1. Memorial Sloan-Kettering Cancer Center, New York, NY
2. IRCCS Galeazzi Orthopedic Institute, Milan, Italy
3. University of British Columbia, Vancouver, British Columbia, Canada
4. Vancouver General Hospital, Vancouver, British Columbia, Canada
5. University Medical Center Utrecht, Utrecht, the Netherlands
6. The Warren Alpert Medical School of Brown University, Providence, RI, USA
7. Rhode Island Hospital, Providence, RI, USA
8. The Miriam Hospital, Providence, RI, USA
9. National Center for Spinal Disorders and Buda Health Center, Budapest, Hungary
10. Johns Hopkins University School of Medicine, Baltimore, MD, USA
11. The University of Texas MD Anderson Cancer Center, Houston, TX, USA