Li, Tian-Ren
Tan, Fen
Lu, Liang-Qiu
Wei, Yi
Wang, Ya-Ni
Liu, Yi-Yin
Yang, Qing-Qing
Chen, Jia-Rong
Shi, De-Qing
Xiao, Wen-Jing
Article History
Received: 8 September 2014
Accepted: 3 October 2014
First Online: 21 November 2014
Competing interests
: The authors declare no competing financial interests.