Negishi-Koga, Takako
Gober, Hans-Jürgen
Sumiya, Eriko
Komatsu, Noriko
Okamoto, Kazuo
Sawa, Shinichiro
Suematsu, Ayako
Suda, Tomomi
Sato, Kojiro
Takai, Toshiyuki
Takayanagi, Hiroshi
Article History
Received: 23 December 2014
Accepted: 13 February 2015
First Online: 31 March 2015
Competing interests
: The authors declare no competing financial interests.