Received: 25 September 2020
Accepted: 30 April 2021
First Online: 9 June 2021
: Ethical approval for this study was obtained from the Institutional Review Board of Yonsei University’s Health System and adhered to the tenets of the Declaration of Helsinki. The KLoSA database has been released to the public for scientific use and contains anonymized patient data, and informed consent was obtained from all participants to participate and have their data used for research purposes.
: Not applicable.
: The authors have no competing interests to declare.