Author contribution: Strakhov VV — concept and design development, article editing; Korsakov MK — responsibility for proper presentation of issues related to data validity and integrity of all parts; Fedorov VN — concept and design development, article editing, responsibility for proper presentation of issues related to data validity and integrity of all parts; Vdovichenko VP — data collection, analysis and interpretation, primary writing; Shetnev AA— writing, language design of the text, compliance with scientific terms; Popova AA— drawing up the list of references by the order of references in the text; Volkhin NN— compliance with requirements to design of the article intended for publication.