Funding for this research was provided by:
korea centers for disease control and prevention (korea centers for disease control and prevention)
Received: 14 June 2021
Accepted: 3 September 2021
First Online: 10 September 2021
: This study was approved and exempted from obtaining informed consent by the Severance Hospital Institutional Review Board (Approval number: 4-2020-0707).
: Not applicable.
: The authors declare that they have no competing interests.