Park, Ji Eun
Kim, Chi Young
Park, Moo Suk
Song, Joo Han
Kim, Young Sam
Lee, Jin Gu
Paik, Hyo Chae
Kim, Song Yee
Article History
Received: 13 September 2017
Accepted: 1 March 2018
First Online: 12 March 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board (IRB) of Severance Hospital (IRB No. 4–2013-0770). Informed consent was waived because this was a retrospective study.
: Not applicable.
: The authors declare that they have no competing interests.
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