Funding for this research was provided by:
Ministry of Science ICT and Future Planning (2017R1A5A2015061)
Received: 22 March 2020
Accepted: 20 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: This study was approved by the institutional review board of Jeonbuk National University Hospital (IRB number, CUH 2019–11-041) and was performed in compliance with the Declaration of Helsinki. In this approval, written informed consent was waived because of the anonymous and retrospective nature of this study.
: Not applicable.
: The authors declare that they have no competing interests.