1. Department of Neurosurgery, Ural State Medical University of the Ministry of Health of the Russian Federation, Yekaterinburg, Russia.
2. Department of Oncology, Ural State Medical University, Ministry of Health of the Russian Federation, Yekaterinburg, Russia.
3. Department of Orthopaedics, Sri Sathya Sai Institute of Higher Medical Sciences, Puttaparthi, India.
4. Department of Neurosurgery, Smolensk State Medical University of the Ministry of Health of the Russian Federation, Smolensk, Russia.