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Authors
Kim, Duck-Ho
Yoo, Sang-Cheol
Kim, Dae-Yun
Min, Byoung-Chul
Choe, Sug-Bong
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Article History
Received: 19 October 2016
Accepted: 28 February 2017
First Online: 31 March 2017
Competing interests
: The authors declare no competing financial interests.
