Mortality comparison between the first and second/third waves among 3,795 critical COVID-19 patients with pneumonia admitted to the ICU: A multicentre retrospective cohort study.
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Lancet Reg Health Eur. 2021 Dec;11:100243. doi: 10.1016/j.lanepe.2021.100243. Epub 2021 Nov 4.
Lancet Reg Health Eur. 2021.
PMID: 34751263
Free PMC article.