Kalimullina, Liliya B.
Kalkamanov, Kh. A.
Akhmadeev, Azat V.
Zakharov, Vadim P.
Sharafullin, Ildus F.
Article History
Received: 13 July 2015
Accepted: 23 October 2015
First Online: 26 November 2015
Competing interests
: The authors declare no competing financial interests.