1. Department of Neurology and Neurosurgery, Stavropol State Medical University, Stavropol, Russian Federation
2. Clinic of Neurosurgery, N. V. Sklifosovsky Research Institute for Emergency Medicine, Moscow Healthcare Department, Moscow, Russian Federation
3. Department of General Medicine, Stavropol State Medical University, Stavropol, Russian Federation
4. Laboratory of Biochemistry, Stavropol Research Institute for Plague Control, Stavropol, Russian Federation.