Qian, Haifeng
Lu, Haiping
Ding, Haiyan
Lavoie, Michel
Li, Yali
Liu, Weiping
Fu, Zhengwei
Article History
Received: 13 January 2015
Accepted: 12 June 2015
First Online: 8 July 2015
Competing interests
: The authors declare no competing financial interests.