Updates are available Correction dated 2021-03-05

Article History

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.