Shin, Yo Sep
Ahn, Shin
Article History
Received: 17 November 2019
Accepted: 21 November 2019
First Online: 29 November 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Compliance with ethical standards was adhered to through Institutional Review Board approval and the study including human participants have been performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendments.
: The research protocol was approved by the institutional review board of Asan Medical Center, which waived the requirement for informed consent because of the retrospective nature of this study.