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Authors
Kang, M
Kim, D W
Lee, H
Lee, Y J
Jung, H J
Paik, H-Y
Song, Y J
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Article History
Received: 2 February 2015
Revised: 19 June 2015
Accepted: 3 August 2015
First Online: 16 September 2015
Competing interests
: The authors declare no conflict of interest.
