Received: 4 October 2020
Accepted: 2 February 2021
First Online: 12 February 2021
Ethics approval and consent to participate
: The Institutional Review Boards of Seoul National University Hospital approved this study (IRB No. H-2005-176-1126), and patient consent was not required.
: The magnetic resonance imaged used in Figs. InternalRef removed and InternalRef removed were basically anonymized. Personal identification on the image was impossible, and there was no need to obtain consent.
: The authors declare they have no competing interests.