Yamawaki, Kengo
Kondo, Yuichiro
Okada, Tsutomu
Oshima, Takeshi
Kakitani, Makoto
Tomizuka, Kazuma
Article History
Received: 1 April 2015
Accepted: 27 November 2015
First Online: 6 January 2016
Competing interests
: The authors declare no competing financial interests.