Shi, Yuechun
Li, Simin
Chen, Xiangfei
Li, Lianyan
Li, Jingsi
Zhang, Tingting
Zheng, Jilin
Zhang, Yunshan
Tang, Song
Hou, Lianping
Marsh, John H.
Qiu, Bocang
Article History
Received: 8 August 2014
Accepted: 18 November 2014
First Online: 9 December 2014
Competing interests
: The authors declare no competing financial interests.