Received: 4 November 2020
Accepted: 6 May 2021
First Online: 17 May 2021
: This study was approved by the institutional review board of Seoul Metropolitan Government Seoul National University Boramae Medical Center. (30-2018-44). All participants provided written informed consent prior to the initiation of the study.
: Not applicable. No individual patient data will be reported.
: The authors declare that they have no competing interests.