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Authors
Kim, Yongju
Kang, Jiheong
Shen, Bowen
Wang, Yanqiu
He, Ying
Lee, Myongsoo
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Article History
Received: 1 July 2015
Accepted: 16 September 2015
First Online: 12 October 2015
Competing interests
: The authors declare no competing financial interests.
