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Article History
Received: 1 June 2021
Accepted: 16 October 2021
First Online: 6 November 2021
Declarations
:
: The authors have no conflicts of interest to declare. All co-authors have seen and agree with the contents of the manuscript and there is no financial interest to report. We certify that the submission is original work and is not under review at any other publication.
: This is a retrospective study. The data used in this study were collected by the clinics of Federal Medical and Biological Agency of Russia in accordance with Russian legislation on protection of personal data and provided to us in anonymized format. Nationwide statistics were obtained from open sources. According to the legislation of the Russian Federation, retrospective studies using anonymized data do not require additional ethical approval.
: Retrospective studies using anonymized data do not require informed consent.
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