Xing, Guang-Fu
Wang, Xiao-Lei
Wan, Yusheng
Chen, Zhi-Hong
Jiang, Yang
Kitajima, Kouki
Ushikubo, Takayuki
Gopon, Phillip
Article History
Received: 30 December 2013
Accepted: 22 April 2014
First Online: 3 June 2014
Competing interests
: The authors declare no competing financial interests.