Liu, Guangqiao
Song, Guangtao
Zhang, Danyang
Zhang, Dejiu
Li, Zhikai
Lyu, Zhixin
Dong, Jianshu
Achenbach, John
Gong, Weimin
Zhao, Xin Sheng
Nierhaus, Knud H
Qin, Yan
Article History
Received: 21 December 2013
Accepted: 11 July 2014
First Online: 10 August 2014
Competing interests
: The authors declare no competing financial interests.