Zhao, Hongyang
Kimura, Hideo
Cheng, Zhenxiang
Osada, Minoru
Wang, Jianli
Wang, Xiaolin
Dou, Shixue
Liu, Yan
Yu, Jianding
Matsumoto, Takao
Tohei, Tetsuya
Shibata, Naoya
Ikuhara, Yuichi
Article History
Received: 27 January 2014
Accepted: 22 May 2014
First Online: 11 June 2014
Competing interests
: The authors declare no competing financial interests.