Yin, Jia
Hoffmann, Michael
Bian, Xiaoying
Tu, Qiang
Yan, Fu
Xia, Liqiu
Ding, Xuezhi
Francis Stewart, A.
Müller, Rolf
Fu, Jun
Zhang, Youming
Article History
Received: 9 July 2015
Accepted: 24 August 2015
First Online: 13 October 2015
Competing interests
: The authors declare no competing financial interests.