Lan, Hong
Chen, Hui
Chen, Li-Cheng
Wang, Bei-Bing
Sun, Li
Ma, Mei-Ying
Fang, Sheng-Guo
Wan, Qiu-Hong
Article History
Received: 10 July 2014
Accepted: 16 October 2014
First Online: 5 November 2014
Competing interests
: The authors declare no competing financial interests.