Zhou, Yue
Yamada, Naoki
Tanaka, Tomohiro
Hori, Takashi
Yokoyama, Satoru
Hayakawa, Yoshihiro
Yano, Seiji
Fukuoka, Junya
Koizumi, Keiichi
Saiki, Ikuo
Sakurai, Hiroaki
Article History
Received: 6 January 2015
Accepted: 31 May 2015
First Online: 9 July 2015
Competing interests
: The authors declare no competing financial interests.