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Jeitziner, M.-M., Moser, A., Wendel-Garcia, P.D., Exl, M.T., Keiser, S., Schuepbach, R.A., Pietsch, U., Cereghetti, S., Boroli, F., Marrel, J., Sigg, A.-A., Ksouri, H., Schott, P., Dullenkopf, A., Fleisch, I., Heise, A., Laurent, J.-C., Jakob, S.M., Hilty , M.P. and Que, Y.-A. 2022. Critical care staffing ratio and outcome of COVID-19 patients requiring intensive care unit admission during the first pandemic wave: a retrospective analysis across Switzerland from the RISC-19-ICU observational cohort. Swiss Medical Weekly. 152, 2526 (Jun. 2022), w30183. DOI:https://doi.org/10.4414/SMW.2022.w30183.