Isozaki, Naoto
Ando, Suguru
Nakahara, Tasuku
Shintaku, Hirofumi
Kotera, Hidetoshi
Meyhöfer, Edgar
Yokokawa, Ryuji
Article History
Received: 8 July 2014
Accepted: 4 December 2014
First Online: 8 January 2015
Competing interests
: The authors declare no competing financial interests.