Funding for this research was provided by:
Ministry of Science, ICT and Future Planning (NRF-2017M2A2A6A01071189)
Article History
Received: 22 April 2020
Accepted: 5 May 2020
First Online: 13 May 2020
Ethics approval and consent to participate
: This study was approved by the Health Institutional Review Boards of Yonsei University Hospital (No. 4–2019-0937). The requirement for informed consent was waived because of the retrospective nature of this study.
: Not applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.