Received: 8 December 2020
Accepted: 25 January 2021
First Online: 6 February 2021
: The authors declare that they have no conflict of interest<b>.</b>
: The study has been conducted in compliance with the principles of the declaration of Helsinki. The study was approved by the institutional review board (IRB number: 1009–062-332) of Seoul National University Hospital.
: Not applicable.