Yamaguchi, Yuji
Suzuki, Mitsuharu
Motoyama, Takao
Sugii, Shuhei
Katagiri, Chiho
Takahira, Katsuya
Ikeda, Shinya
Yamada, Hiroko
Nakayama, Ken-ichi
Article History
Received: 12 August 2014
Accepted: 4 November 2014
First Online: 21 November 2014
Competing interests
: The authors declare no competing financial interests.