Kuchmizhak, Aleksandr
Gurbatov, Stanislav
Vitrik, Oleg
Kulchin, Yuri
Milichko, Valentin
Makarov, Sergey
Kudryashov, Sergey
Article History
Received: 2 October 2015
Accepted: 10 December 2015
First Online: 18 January 2016
Competing interests
: The authors declare no competing financial interests.