Oh, Tak Kyu
Song, In-Ae
Article History
Received: 1 October 2020
Accepted: 20 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This population-based observational study was conducted and reported according to the Reporting of Observational Studies in Epidemiology guidelines. The study protocol was approved by the Institutional Review Board of Seoul National University Bundang Hospital (X-2004–604-905) and the Health Insurance Review and Assessment Service (NHIS-2020–1-291). Informed consent was waived because the data analyses were performed retrospectively using anonymized data derived from the South Korean NHIS database.
: Not applicable.
: The authors declare that they have no competing interests.