Takahashi, Hidetoshi
Jung Heo, Yun
Arakawa, Nobuchika
Kan, Tesuo
Matsumoto, Kiyoshi
Kawano, Ryuji
Shimoyama, Isao
Article History
Received: 23 November 2015
Revised: 25 June 2016
Accepted: 27 June 2016
First Online: 10 October 2016
Competing interests
: The authors declare no conflict of interest.