Takayama, Tomohiro
Yaresko, Alexander
Matsumoto, Akiyo
Nuss, Jürgen
Ishii, Kenji
Yoshida, Masahiro
Mizuki, Junichiro
Takagi, Hidenori
Article History
Received: 16 July 2014
Accepted: 9 October 2014
First Online: 29 October 2014
Competing interests
: The authors declare no competing financial interests.