Liu, Huang
Liu, Bei
Lin, Li-Chiang
Chen, Guangjin
Wu, Yuqing
Wang, Jin
Gao, Xueteng
Lv, Yining
Pan, Yong
Zhang, Xiaoxin
Zhang, Xianren
Yang, Lanying
Sun, Changyu
Smit, Berend
Wang, Wenchuan
Article History
Received: 11 July 2014
Accepted: 5 September 2014
First Online: 9 October 2014
Competing interests
: The authors declare no competing financial interests.