Yamaguchi, Yoshitaka
Wada, Manabu
Sato, Hidenori
Nagasawa, Hikaru
Koyama, Shingo
Takahashi, Yoshimi
Kawanami, Toru
Kato, Takeo
Article History
Received: 27 July 2014
Revised: 31 January 2015
Accepted: 3 February 2015
First Online: 19 March 2015
Competing interests
: The authors declare no conflict of interest.