Li, Bing
Yao, Fei
Bae, Jung Jun
Chang, Jian
Zamfir, Mihai Robert
Le, Duc Toan
Pham, Duy Tho
Yue, Hongyan
Lee, Young Hee
Article History
Received: 19 September 2014
Accepted: 3 December 2014
First Online: 7 January 2015
Competing interests
: The authors declare no competing financial interests.