Funding for this research was provided by:
Ministry of Education, Science and Technology (NRF-2017R1C1B2010379)
Ministry of Education (NRF-2018R1D1A1B07049228)
Received: 21 July 2020
Accepted: 14 September 2020
First Online: 1 October 2020
Ethics approval and consent to participate
: This study was approved by the Health Institutional Review Boards of Yonsei University Hospital (No. 4–2019-0887). 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.