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Haas, L.E., Karakus, A., Fijen, J.W. et al. True changes in patient characteristics and outcomes or partially a reflection of different study populations?. Intensive Care Med 44, 1195–1196 (2018). https://doi.org/10.1007/s00134-018-5238-1
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DOI: https://doi.org/10.1007/s00134-018-5238-1