Chen, Shaoqiang
Zhu, Lin
Yoshita, Masahiro
Mochizuki, Toshimitsu
Kim, Changsu
Akiyama, Hidefumi
Imaizumi, Mitsuru
Kanemitsu, Yoshihiko
Article History
Received: 28 May 2014
Accepted: 15 December 2014
First Online: 16 January 2015
Competing interests
: The authors declare no competing financial interests.