Article History
Received: 3 September 2020
Accepted: 13 December 2020
First Online: 5 January 2021
Ethics approval and consent to participate
: The institutional review board (IRB) of Seoul National University Hospital approved this study. The study was exempted of the informed consents from the IRB (no. H-1991-117-1080).
: The study was exempted of the informed consents from the IRB (no. H-1991-117-1080).
: The authors declare that they have no competing interests.