Wada, Takayuki
Maruyama, Fumito
Iwamoto, Tomotada
Maeda, Shinji
Yamamoto, Taro
Nakagawa, Ichiro
Yamamoto, Saburo
Ohara, Naoya
Article History
Received: 4 June 2015
Accepted: 6 November 2015
First Online: 4 December 2015
Competing interests
: The authors declare no competing financial interests.