1. Department of Neurosurgery, Toronto Western Hospital, University Health Network; University of Toronto; Toronto Ontario Canada
2. Graduate Entry Medicine; University College Cork; Cork Ireland
3. Department of Health Services, University of Washington; Seattle Washington
4. Department of Neurosurgery, University of Kansas; Kansas City Kansas
5. Department of Orthopaedic Surgery, CORE Institute; Sun City West Arizona
6. Department of Orthopaedic Surgery, Sunnybrook Health Sciences Center; Toronto Ontario Canada
7. Department of Orthopaedic Surgery, University of British Columbia; Vancouver British Columbia Canada
8. Department of Orthopaedic Surgery, Vancouver Coastal Health; Vancouver British Columbia Canada
9. Department of Orthopaedic Surgery, West Virginia University; Morgantown West Virginia
10. Department of Neurosurgery, Warren Alpert Medical School of Brown University; Providence Rhode Island
11. Department of Neurosurgery, The University of Texas MD Anderson Cancer Center; Houston Texas
12. Department of Orthopaedic Surgery, Mayo Clinic; Rochester Minnesota
13. Department of Radiation Oncology, Sunnybrook Health Sciences Center; Toronto, Ontario Canada
14. Department of Neurosurgery, University of Pennsylvania; Philadelphia Pennsylvania
15. Department of Orthopaedic Surgery, Thomas Jefferson University; Philadelphia Pennsylvania