Author contribution: Maksimova МYu — concept formulation, data synthesis, manuscript writing; Ivanov AV — concept formulation, literature analysis, assessment of low molecular weight aminothiols; Nikiforova KA — primary laboratory data acquisition; Virus ED — laboratory data synthesis; Suanova ЕТ — statistical data processing; Ochtova FR — clinical assessment of patients; Piradov MA — study management; Kubatiev AA — study management.

Compliance with ethical standards: the study was approved by the Ethics Committee of the Research Center of Neurology (protocol № 3-1/16 dated March 16, 2016), it was carried out in accordance with the basic principles outlined in the Declaration of Helsinki.