1. Department of Orthopaedics, Alrijne Hospital, Leiderdorp, The Netherlands
2. Spine Surgery, Orthopaedics and Traumatology, Centro Mdico Integral Fitz Roy, Buenos Aires, Argentina
3. Spine Surgery, Orthopaedics and Traumatology, Sanatorio Gemes, Buenos Aires, Argentina
4. Professor associate of Orthopedics and Traumatology, University of Development, Santiago, Chile
5. Spine Unit, Department of Orthopedics and Traumatology, Clinica Alemana, Santiago, Chile
6. Department of Neurosurgery, BG Klinikum Bergmannstrost, Halle, Germany
7. Department of Orthopedic Surgery, NYU Grossman School of Medicine, New York, USA
8. Gerling Institute, Brooklyn, NY, USA
9. Division of Spine Surgery, Department of Orthopedic Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School University, Nanjing, China
10. Department of Orthopaedics, Noordwest Hospitals, Alkmaar, The Netherlands