Demidov, Vladislav E.
Urazhdin, Sergei
Liu, Ronghua
Divinskiy, Boris
Telegin, Andrey
Demokritov, Sergej O.
Article History
Received: 13 August 2015
Accepted: 13 December 2015
First Online: 28 January 2016
Competing interests
: The authors declare no competing financial interests.