Ozawa, Shin
Miyahara, Masaaki
Ohtani, Eiji
Koroleva, Olga N.
Ito, Yoshinori
Litasov, Konstantin D.
Pokhilenko, Nikolay P.
Article History
Received: 8 January 2014
Accepted: 2 May 2014
First Online: 22 May 2014
Competing interests
: The authors declare no competing financial interests.