Song, Yunsun
Han, Seongsik
Kim, Byung Jun
Oh, Seong Heum
Kim, Jin Su
Kim, Tae Il
Lee, Deok Hee http://orcid.org/0000-0003-0355-0449
Article History
Received: 21 June 2020
Accepted: 20 August 2020
First Online: 28 August 2020
Compliance with ethical standards
:
: The authors have no conflicts to disclose<b>.</b>
: The institutional review board at Asan Medical Center approved this study (2020–0198).
: The IRB at Asan Medical Center waived the requirement to obtain written informed consent from the patients as this study is a retrospective study, and it is expected that the risk to study subjects will be extremely low.