Kumura, Ko
Wakiyama, Yoshinari
Ueda, Kazutaka
Umemura, Eijiro
Hirai, Yoko
Yamada, Keiko
Ajito, Keiichi
Article History
Received: 22 August 2017
Revised: 7 October 2017
Accepted: 7 October 2017
First Online: 8 November 2017
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.