Liu, Ze
Xiong, Min
Gong, Junbo
Zhang, Yan
Bai, Nan
Luo, Yunping
Li, Luyuan
Wei, Yuquan
Liu, Yanhua
Tan, Xiaoyue
Xiang, Rong
Article History
Received: 23 April 2014
Accepted: 2 June 2014
First Online: 27 June 2014
Competing interests
: The authors declare no competing financial interests.