Shen, Shaohua
Zhou, Jigang
Dong, Chung-Li
Hu, Yongfeng
Tseng, Eric Nestor
Guo, Penghui
Guo, Liejin
Mao, Samuel S.
Article History
Received: 4 August 2014
Accepted: 29 September 2014
First Online: 15 October 2014
Competing interests
: The authors declare no competing financial interests.