V. V. Ramensky
Polenov Neurosurgery Institute – the branch of Almazov National Medical Research Centre 
Russian Federation

Vladislav V. Ramensky – Postgraduate Student at the Department of Neurosurgery

2 Akkuratova street, St. Petersburg, Russian Federation, 197341 

A. Yu. Ulitin
Polenov Neurosurgery Institute – the branch of Almazov National Medical Research Centre ; North-Western State Medical University named after I. I. Mechnikov 
Russian Federation

Alexey Yu. Ulitin – Dr. of Sci. (Med.), Full Professor, Honored Doctor of Russian Federation, Neurosurgeon of the Highest Qualification Category, Head at the Department of Neurosurgery No 4; Professor at the Department of Neurosurgery named after prof. A. L. Polenov

2 Akkuratova street, St. Petersburg, Russian Federation, 197341

41 Kirochnaya street, St. Petersburg, Russian Federation, 191015

V. Ya. Kalmens
Polenov Neurosurgery Institute – the branch of Almazov National Medical Research Centre 
Russian Federation

Vyacheslav Ya. Kalmens – Cand. of Sci. (Med.), Neurosurgeon at the Department of Neurosurgery No. 4

2 Akkuratova street, St. Petersburg, Russian Federation, 197341