Text and Data Mining valid from 2018-11-15
Received: 14 July 2018
Accepted: 22 October 2018
First Online: 15 November 2018
Ethics approval and consent to participate
: Approval of the local Ethics Committee of Federal State Autonomous Institution (N.N. Burdenko National Medical Research Center of Neurosurgery) of the Ministry of Health of the Russian Federation was received.
: Not applicable
: The authors declare that they have no competing interests.