Author contribution: Fitilev SB — development of article concept, analysis of scientific data, article editing; Vozzhaev AV — development of article concept, analysis of scientific data, writing an article; Shkrebniova II — collection of data, analysis of scientific data, writing an article; Kliuev DA — review of the article-related publications, statistical calculations, writing an article; Saakova LN — collection of data, review of the article-related publications.

Compliance with ethical standards: voluntary informed consent was obtained from every participant. Questioning was conducted on a voluntary basis.