Wang, Haimin
Cao, Wenda
Liu, Chang
Xu, Yan
Liu, Rui
Zeng, Zhicheng
Chae, Jongchul
Ji, Haisheng
Article History
Received: 14 November 2014
Accepted: 24 March 2015
First Online: 28 April 2015
Competing interests
: The authors declare no competing financial interests.