Aim of the study
Materials and methods
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Publication stageIn Press Journal Pre-Proof
Conflict of Interest The authors declare no conflict of interest.
Financial support. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Compliance with Ethical Standards
The study protocol was approved by the Ethics Committee of the I.M. Sechenov University (№ 09-19, 16.09.2019). All patients signed informed consent. All described procedures were carried out strictly in accordance with the Helsinki Declaration.
L.Yu. Milovanova provided scientific guidance, developed the basic concept of the article. S.Yu. Milovanova collected and analyzed data, compiled a database. M.V. Taranova. finalized the text of the article. A.V. Volkov collected and processed information, wrote and revised part of the text. K.S. Nezhdanov carried out a statistical analysis of the data obtained and English translation