Correction: Risk factors for critical COVID-19 illness during Delta- and Omicron-predominant period in Korea; using K-COV-N cohort in the National health insurance service.

This document is a correction notice for a study titled "Risk factors for critical COVID-19 illness during Delta- and Omicron-predominant period in Korea; using K-COV-N cohort in the National health insurance service." The correction pertains to the funding statement, which was published incorrectly. The correct funding statement acknowledges that the study was conducted as part of a public-private joint research effort on COVID-19, co-hosted by the KDCA (Korea Disease Control and Prevention Agency) and the NHIS (National Health Insurance Service) in South Korea. The study also received support from the Korea National Institute of Health. The funders did not have any involvement in the study design, data collection and analysis, decision to publish, or manuscript preparation. [Extracted from the article]