Received: 10 December 2020
Accepted: 27 January 2021
First Online: 15 February 2021
Change Date: 5 March 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/S12886-021-01890-X
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Severance Hospital (IRB No 1–2016-0027) by which the requirement for informed consent was waived because of the retrospective nature of this study.
: Not applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as potential conflicts of interest.