Received: 30 November 2020
Accepted: 1 February 2021
First Online: 11 February 2021
Ethics approval and consent to participate
: This study protocol was consistent with the ethical guidelines of the 1975 Declaration of Helsinki and was approved by the institutional review board of the Jeonbuk National University Hospital (approval number: CUH 2019–05-009). Written informed consent was waived due to the retrospective nature of the study.
: Not applicable.
: The authors declare no competing interests.