Li, Yuge
Ouyang, Jie
Wang, Ya-Yun
Hu, Rui
Xia, Kuaifei
Duan, Jun
Wang, Yaqin
Tsay, Yi-Fang
Zhang, Mingyong
Article History
Received: 19 December 2014
Accepted: 9 March 2015
First Online: 29 April 2015
Competing interests
: The authors declare no competing financial interests.