Received: 24 May 2019
Accepted: 30 April 2020
First Online: 14 May 2020
Change Date: 29 December 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via the original article.
Ethics approval and consent to participate
: This study was approved by the institutional review board of the Samsung Medical Center. The institutional review board of the Samsung Medical Center waived the need for informed consent for this retrospective study.
: Not applicable.
: The authors declare that they have no competing interests.