Received: 21 September 2020
Accepted: 28 January 2021
First Online: 15 February 2021
Ethics approval and consent to participate
: This study was approved by the institutional review board of Chungbuk National University Hospital (IRB number: 2020–04–015-001). Because Health Insurance Review and Assessment Service of Korea deliver the analysis result values with analysis code that researchers produce, written informed consent was waived by the institutional review board. The data used in this study was anonymized before its use.
: Not applicable.
: All authors declare that there are no conflicts.