Yu, Lu
Wang, Wei
Ling, Shenglong
Liu, Sanling
Xiao, Liang
Xin, Yanlong
Lai, Chaohua
Xiong, Ying
Zhang, Longhua
Tian, Changlin
Article History
Received: 18 September 2014
Accepted: 16 December 2014
First Online: 19 January 2015
Competing interests
: The authors declare no competing financial interests.