Liu, Ningning
Liu, Chunjiao
Li, Xiaofen
Liao, Siyan
Song, Wenbin
Yang, Changshan
Zhao, Chong
Huang, Hongbiao
Guan, Lixia
Zhang, Peiquan
Liu, Shouting
Hua, Xianliang
Chen, Xin
Zhou, Ping
Lan, Xiaoying
Yi, Songgang
Wang, Shunqing
Wang, Xuejun
Dou, Q. Ping
Liu, Jinbao
Article History
Received: 30 December 2013
Accepted: 21 May 2014
First Online: 10 June 2014
Competing interests
: The authors declare no competing financial interests.