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Authors
Kim, Hong Hee
Park, Soohyung
Yi, Yeonjin
Son, Dong Ick
Park, Cheolmin
Hwang, Do Kyung
Choi, Won Kook
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Article History
Received: 16 October 2014
Accepted: 11 February 2015
First Online: 10 March 2015
Competing interests
: The authors declare no competing financial interests.
