1. Bashkir State Medical University, 450008 Ufa, Russia
2. Department of Neurosurgery, Peoples’ Friendship University of Russia (RUDN University), 117198 Moscow, Russia
3. Department of Neurosurgery, Podolsk Regional Hospital, 141110 Moscow, Russia
4. Department of Obstetrics and Gynecology, Tyumen State Medical University, 625000 Tyumen, Russia
5. Department of Neurosurgery, Azienda Ospedaliero Universitaria Pisana (AOUP), University of Pisa, 56100 Pisa, Italy