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Authors
Ka, Sun-O
Hwang, Hong Pil
Jang, Jong-Hwa
Hyuk Bang, In
Bae, Ui-Jin
Yu, Hee Chul
Cho, Baik Hwan
Park, Byung-Hyun
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Article History
Received: 28 May 2015
Accepted: 10 September 2015
First Online: 1 October 2015
Competing interests
: The authors declare no competing financial interests.
