Li, Yuanyuan
Zhu, Hongli
Zhu, Shuze
Wan, Jiayu
Liu, Zhen
Vaaland, Oeyvind
Lacey, Steven
Fang, Zhiqiang
Dai, Hongqi
Li, Teng
Hu, Liangbing
Article History
Received: 11 September 2014
Revised: 2 October 2014
Accepted: 2 October 2014
First Online: 9 January 2015
Competing interests
: The authors declare no conflict of interest.