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Authors
Han, Hye-Sook
Choi, Byeong Hun
Kim, Jun Seok
Kang, Geon
Koo, Seung-Hoi
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Article History
Received: 22 April 2016
Accepted: 23 October 2017
First Online: 30 November 2017
Competing interests
: The authors declare no competing financial interests.
