Kozak, Dmytro S.
Sergiienko, Ruslan A.
Shibata, Etsuro
Iizuka, Atsushi
Nakamura, Takashi
Article History
Received: 8 July 2015
Accepted: 19 January 2016
First Online: 16 February 2016
Competing interests
: The authors declare no competing financial interests.