Document is current

Article History

Received: 7 December 2018

Revised: 5 March 2019

Accepted: 3 April 2019

First Online: 3 September 2019

COMPLIANCE WITH ETHICAL STANDARDS

: <i>Conflict of interests.</i> The authors declare that they have no obvious or potential conflict of interest related to the publication of this article.

: <i>Statement of compliance with standards of research involving humans as subjects</i>. All procedures performed in studies involving human participants were in accordance with the biomedical ethics principles formulated in the 1964 Helsinki Declaration and its later amendments and approved by the local bioethics commission of the Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences (Moscow). Each participant submitted a voluntary written informed consent, signed by him after explaining to him the potential risks and benefits, as well as the nature of the forthcoming study.