Chen, Shuling
Liao, Bing
Zhong, Zhihai
Zheng, Yanling
Liu, Baoxian
Shan, Quanyuan
Xie, Xiaoyan
Zhou, Luyao
Article History
Received: 26 January 2016
Accepted: 13 July 2016
First Online: 11 August 2016
Competing interests
: The authors declare no competing financial interests.