Author contribution: Chechetkin AO — study design, acquisition of ultrasound imaging data, data interpretation, manuscript preparation; Moskalenko AN — clinical data acquisition, analysis and interpretation; Fedotova EYu, Illarioshkin SN — study design, manuscript editing.

Compliance with ethical standards: the study was approved by the Ethics Committee of the Research Center of Neurology (Protocol No. 2-6/20 dated March 18, 2020)