Association between the presence of delirium during intensive care unit admission and cognitive impairment or psychiatric problems: the Korean ICU National Data Study.

"Declarations Ethics approval and consent to participateThe Institutional Review Board of Samsung Medical Center approved this study and waived the requirement for informed consent because of the observational nature of the study. Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding This research was supported by a Grant of the Korea Health Technology R&D project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (Grant number: HI19C0481, HC19C0226). The funder had no role in the design of the study, the data collection and analysis, the interpretation of data and in writing the manuscript."