Funding for this research was provided by:
National Research Foundation of Korea (2017R1A5A2015061, 2017R1E1A1A01074533)
Received: 22 November 2020
Accepted: 29 December 2020
First Online: 9 January 2021
Ethics approval and consent to participate
: This study was approved by the institutional review board of Jeonbuk National University Hospital (IRB number, CUH 2015–09–024-002) 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.