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Authors
Kang, H.
Choi, H. J.
Kang, S. W.
Shin, S. E.
Choi, G. S.
Bae, D. H.
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Article History
Received: 28 October 2015
Accepted: 22 February 2016
First Online: 15 March 2016
Competing interests
: The authors declare no competing financial interests.
