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Authors
Jeong, B-C
Kang, I-H
Hwang, Y-C
Kim, S-H
Koh, J-T
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Article History
Received: 11 July 2014
Revised: 16 September 2014
Accepted: 22 September 2014
First Online: 20 November 2014
Competing interests
: The authors declare no conflict of interest.
