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Authors
Hong, S M
Park, C W
Kim, S W
Nam, Y J
Yu, J H
Shin, J H
Yun, C H
Im, S-H
Kim, K-T
Sung, Y C
Choi, K Y
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Article History
Received: 19 January 2015
Revised: 3 September 2015
Accepted: 4 September 2015
First Online: 16 November 2015
Competing interests
: The authors declare no conflict of interest.
