1. Federal State Budgetary Institution the Federal Center of Neurosurgery of the Ministry of Health of the Russian Federation, 625062 Tyumen, Russia
2. Department of Neurosurgery, State Medical University (Sechenov University), 119991 Moscow, Russia
3. Educational and Scientific Institute of Neurosurgery, Peoples’ Friendship University of Russia RUDN University, 117198 Moscow, Russia
4. Department of Neurosurgery, National University of Mexico Hospital General, Durango 34030, Mexico
5. Department of General Medicine, School of Medicine, University of Zenica, 72000 Zenica, Bosnia and Herzegovina
6. School of Medicine, University of Central Lancashire, Preston PR02AG, UK
7. Autonomous University of Santo Domingo (UASD), Santo Domingo 10103, Dominican Republic
8. Petrovsky Russian Scientific Center of Surgery, 121359 Moscow, Russia
9. Spine Center Hospital del Mar, Sagrat Cor University Hospital, 08029 Barcelona, Spain
10. Instituto Soriano de Cirugía de Columna Mínimamente Invasiva at ABC Hospital, Neurological Center, Santa Fe Campus, Mexico City 05100, Mexico
11. NCC No. 2 Federal State Budgetary Scientific Institution Russian Scientific Center Named after. Acad. B.V. Petrovsky (Central Clinical Hospital Russian Academy of Sciences), 121359 Moscow, Russia
12. Department of Neurosurgery, Hospital Angeles Villahermosa, Sante Fe, Mexico City 01210, Mexico
13. Department of Neurosurgery, Russian People’s Friendship University, 117198 Moscow, Russia
14. Department of Neurosurgery, University Hospital Marburg, Baldingerstr., 35033 Marburg, Germany
15. Department of Head and Neck, Unidad de Neurociencias, Instituto Nacional de Cancerología, Mexico City 14080, Mexico
16. Department of Neurosurgery, Medical Park Ankara Hospital, Kent Koop Mah 1868. Sok, Batıkent Blv. No:15, 06680 Ankara, Turkey
17. Department of Neurosurgery, School of Medicine, Yuksek Ihtisas University, 06520 Ankara, Turkey