Jin, Yuanyuan
Lu, Shengjie
Hermann, Andreas
Kuang, Xiaoyu
Zhang, Chuanzhao
Lu, Cheng
Xu, Hongguang
Zheng, Weijun
Article History
Received: 17 March 2016
Accepted: 29 June 2016
First Online: 21 July 2016
Competing interests
: The authors declare no competing financial interests.