Yan, Zhen
Bai, Xiao-chen
Yan, Chuangye
Wu, Jianping
Li, Zhangqiang
Xie, Tian
Peng, Wei
Yin, Chang-cheng
Li, Xueming
Scheres, Sjors H. W.
Shi, Yigong
Yan, Nieng
Article History
Received: 12 September 2014
Accepted: 12 November 2014
First Online: 15 December 2014
Competing interests
: The authors declare no competing financial interests.