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Authors
Jeong, Hae-Chang
Park, Hong-Gyu
Lee, Ju Hwan
Jung, Yoon Ho
Jang, Sang Bok
Seo, Dae-Shik
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Article History
Received: 16 October 2014
Accepted: 28 January 2015
First Online: 2 March 2015
Competing interests
: The authors declare no competing financial interests.
