Xie, Wen-Jie
Li, Ming-Xia
Jiang, Zhi-Qiang
Tan, Qun-Zhao
Podobnik, Boris
Zhou, Wei-Xing
Stanley, H. Eugene
Article History
Received: 7 October 2015
Accepted: 25 November 2015
First Online: 8 January 2016
Competing interests
: The authors declare no competing financial interests.