1. Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL, USA
2. International Spine Research & Innovation Initiative (ISRII), Chicago, IL, USA
3. Department of Neurosurgery, Neuroscience Institute, Virginia Mason Medical Center, Seattle, WA, USA
4. Department of Radiation Oncology, University of California Irvine, Orange, CA, USA
5. Indiana Spine Group, St Carmel, Indiana, USA
6. Research Department, AO Spine International, Davos, Switzerland
7. Department of Orthopaedics & Traumatology, The University of Hong Kong, Hong Kong, SAR China
8. Department of Orthopaedic and Trauma Surgery, Tampere University Hospital, Tampere, Finland
9. Department of Orthopaedic and Trauma Surgery, Assiut University Medical School, Assiut, Egypt
10. Department of Orthopaedics, Churruca Hospital de Buenos Aires, Buenos Aires, Argentina
11. Department of Neurosurgery, Donald and Barbara Zucker School of Medicine at Hofstra, Hempstead, NY, USA
12. Department of Orthopaedic Surgery, University of Arizona College of Medicine, Phoenix, AZ, USA