Shulga, K. V. http://orcid.org/0000-0003-1422-4681
Il’ichev, E.
Fistul, M. V. http://orcid.org/0000-0002-0265-2534
Besedin, I. S.
Butz, S.
Astafiev, O. V.
Hübner, U. http://orcid.org/0000-0002-4885-9477
Ustinov, A. V.
Article History
Received: 6 July 2017
Accepted: 13 December 2017
First Online: 11 January 2018
Competing interests
: The authors declare no competing financial interests.