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Authors
Ko, Eun-Hye
Kim, Hyo-Joong
Lee, Sang-Mok
Kim, Tae-Woong
Kim, Han-Ki
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Article History
Received: 23 November 2016
Accepted: 27 March 2017
First Online: 24 April 2017
Competing interests
: The authors declare no competing financial interests.
