1. Irkutsk State Medical University, Krasnogo Vosstaniya St. 1, Irkutsk, Russia
2. Irkutsk Scientific Center of Surgery and Traumatology, Bortsov Revolutsii St. 1, Irkutsk, Russia
3. Railway Clinical Hospital, Irkutsk-Passazhirskiy of Russian Railways Ltd., Botkina St. 10, Irkutsk, Russia
4. Irkutsk State Medical Academy of Postgraduate Education, Jubileiniyi 100, Irkutsk, Russia
5. National Center of Neurosurgery, 34/1 Turan Av., Astana, Kazakhstan
6. Department of Neurosurgery Research, Barrow Neurological Institute, St. Joseph’s Hospital and Medical Center, 350 West Thomas Road, Phoenix, AZ 85013, USA