Article History
Received: 4 May 2020
Accepted: 23 December 2020
First Online: 5 January 2021
Ethics approval and consent to participate
: Ethics approval was obtained from the Institutional Review Board of Kangbuk Samsung Hospital for the study protocol (KBSMC 2018-01-036). Informed consent was waived by the board.
: Not applicable.
: No potential conflicts of interest relevant to this article were reported.