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Authors
Lee, S-H
Han, K
Yang, H K
Kim, H-S
Cho, J-H
Kwon, H-S
Park, Y-M
Cha, B-Y
Yoon, K-H
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Article History
Received: 30 October 2014
Accepted: 7 December 2014
First Online: 27 April 2015
Competing interests
: The authors declare no conflict of interest.
