Ming, Leiguo
Jin, Fang
Huang, Ping
Luo, Hailang
Liu, Wenjia
Zhang, Leilei
Yuan, Wei
Zhang, Yongjie
Jin, Yan
Article History
Received: 13 February 2014
Accepted: 14 October 2014
First Online: 27 November 2014
Competing interests
: The authors declare no competing financial interests.