Zhang, Wei
Xue, Deting
Yin, Houfa
Xie, Hui
Ma, Honghai
Chen, Erman
Hu, Dongcai
Pan, Zhijun
Article History
Received: 5 June 2015
Accepted: 19 October 2015
First Online: 25 January 2016
Competing interests
: The authors declare no competing financial interests.
: All authors have contributed significantly and are in agreement with the content of the manuscript. All authors have no relevant financial relationships to disclose.