Kim, Yeon Joo
Kim, Su Ssan
Song, Si Yeol
Choi, Eun Kyung
Article History
Received: 27 March 2018
Accepted: 2 July 2018
First Online: 11 July 2018
Ethics approval and consent to participate
: Approval to conduct this study (version 1.1 on June 2, 2017) was granted by the Institutional Review Board of Seoul Asan Medical Center (S2017–0557-0002), and the present retrospective study was conducted in accordance with the Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.
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