Chen, Rui-Qing
Lu, Qin-Qin
Cheng, Qing-Di
Ao, Liang-Bo
Zhang, Chen-Yan
Hou, Hai
Liu, Yong-Ming
Li, Da-Wei
Yin, Da-Chuan
Article History
Received: 18 September 2014
Accepted: 17 December 2014
First Online: 19 January 2015
Competing interests
: The authors declare no competing financial interests.