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Article History

Received: 21 December 2018

Revised: 28 March 2019

Accepted: 3 April 2019

First Online: 1 November 2019

COMPLIANCE WITH ETHICAL STANDARDS

: Conflict of interests . The authors declare that they have no real or potential conflict of interest with respect to publication of this article.

: Statement of compliance with standards of research involving humans as subjects. All studies were in accordance with the biomedical ethical standards of the 1964 Helsinki Declaration and its later amendments and were approved by the Ethics Committee at the Bechtereva Institute of the Human Brain (Russian Academy of Sciences, St. Petersburg, Russia) and the Local Ethics Committee of Graubünden (canton of Grisons, Switzerland). All participants voluntarily gave their written informed consent for participation after being informed about potential risks and benefits and the study procedure.