Wakiyama, Yoshinari
Kumura, Ko
Umemura, Eijiro
Masaki, Satomi
Ueda, Kazutaka
Watanabe, Takashi
Yamamoto, Mikio
Hirai, Yoko
Ajito, Keiichi
Article History
Received: 10 October 2015
Revised: 2 November 2015
Accepted: 12 November 2015
First Online: 16 December 2015
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.