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Authors
Lee, Sangyeop
Esfarjani, Keivan
Luo, Tengfei
Zhou, Jiawei
Tian, Zhiting
Chen, Gang
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Article History
Received: 24 September 2013
Accepted: 27 February 2014
First Online: 28 April 2014
Competing interests
: The authors declare no competing financial interests.
