1. Department of Neurosurgery, People of Friendship University RUDN, Moscow, Russia
2. Deparment of Neurosurgery, City Clinical Hospital № 68 Gbuz Gkb Im. V.P. Demikhova, Moscow, Russia
3. Department of Head and Neck Surgery, Neurosurgery Unit, Garibaldi, Hospital, Catania, Italy
4. London School of Hygiene and Tropical Medicine, Branford Teaching Hospitals NHS Foundation Trust, Bradford, UK
5. Department of Neurosurgery, Medical Park Ankara Hospital, Ankara, Turkey
6. Department of Neurosurgery, School of Medicine, Yuksek Ihtisas University, Ankara, Turkey
7. Deparment of Orthopedic, Hospital Dr. Dario Contreras Santo Domingo, Santo Domingo Este, Dominican Republic
8. Department of Neurosurgery, Bhawani Hospital and Research Center, Birgunj, Nepal