Kang, Jieun
Han, Minkyu
Hong, Sang-Bum
Lim, Chae-Man
Koh, Younsuck
Huh, Jin Won http://orcid.org/0000-0002-3449-0461
Article History
Received: 7 April 2019
Accepted: 14 August 2019
First Online: 20 August 2019
Compliance with ethical standards
: The study protocol was approved by the institutional review board of Asan Medical Center (No. 2018-0206), and the need for informed consent was waived due to the retrospective nature of the study.
: The authors declare that they have no conflict of interest.
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