Kim, Myong
Song, Cheryn
Jeong, In Gab
Choi, Seung-Kwon
Park, Myungchan
Shim, Myungsun
Kim, Young Seok
You, Dalsan
Hong, Jun Hyuk
Kim, Choung-Soo
Ahn, Hanjong
Article History
Received: 18 May 2017
Accepted: 6 March 2018
First Online: 9 March 2018
Ethics approval and consent to participate
: This study was approved by the institutional review board of Asan Medical Center (Approval No. S2015–0709-0002), Seoul, South Korea. The need for informed consent was waived by the institutional review board because of the minimal risk for potential harms. All personal information was anonymized before analysis.
: Not applicable.
: The authors declare that they have no competing interests.
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