Shang, Jian
Zheng, Yuan
Guo, Xiaohong
Mo, Jiayin
Xie, Xueping
Xiong, Ying
Liu, Yingle
Wu, Kailang
Wu, Jianguo
Article History
Received: 11 January 2015
Accepted: 27 March 2015
First Online: 13 May 2015
Competing interests
: The authors declare no competing financial interests.