Received: 12 June 2018
Accepted: 28 August 2018
First Online: 15 September 2018
Ethics approval and consent to participate
: The Ethics Committee of the Federal State Budgetary Institution, Research Institute for Complex Issues of Cardiovascular Diseases approved this study (protocol No. 22 from 15.08.2017).
: Not applicable.
: The authors declare that they have no competing interests.
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