**Author details**

Valentina Ignatova1\*, Lyudmila Todorova2 and Jivko Surchev3

\*Address all correspondence to: valyaig@abv.bg

1 National Heart Hospital‐MHAT, Clinic of neurology, Sofia, Bulgaria

2 Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria

3 Medical University of Sofia, Department of Neurosurgery, St Ivan Rilski University Hospi‐ tal, Clinic of Neurosurgery, Sofia, Bulgaria

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