To the Editor:
The authors regret that there were errors in text. This notice corrects the typo error of the Institutional Review Board number.
Content of correction:
Present corrected text
“This study was approved by the Institutional Review Board (IRB) of Severance Hospital on 2020 (#4-2020-0429)” to “This study was approved by the Institutional Review Board (IRB) of Severance Hospital on 2020 (#4-2020-0492)”



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