1. Hospital del Trabajador, Santiago, Chile
2. Clínica Universidad de los Andes, Santiago, Chile
3. Universidad Andrés Bello, Hospital del Trabajador, Facultad de Medicina, Santiago, Chile
4. Centro Médico Integral Fitz Roy, Buenos Aires, Argentina
5. Sanatorio Güemes, Buenos Aires, Argentina
6. Hospital General de Agudos Dr. Teodoro Álvarez, Buenos Aires, Argentina
7. Hospital Roberto del Río, Santiago, Chile
8. Elite Spine Health and Wellness Center, Florida, USA
9. Department of Orthopedic and Traumatology, University del Desarrollo, Santiago, Chile
10. Spine Unit, Department of Traumatology, Clínica Alemana, Santiago, Chile
11. Center for Spinal and Scoliosis Surgery, Malteser Waldrankenhaus St. Marien, Erlangen, Germany
12. Department of Orthopedics and Traumatology, Paracelsus Private Medical University Nuremberg, Nuremberg, Germany