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Rothen, Hans U; Stricker, Kay; Einfalt, Johanna; Bauer, Peter; Metnitz, Philip G H; Moreno, Rui P; Takala, Jukka (2007). Variability in outcome and resource use in intensive care units. Intensive care medicine, 33(8), pp. 1329-36. Berlin: Springer-Verlag 10.1007/s00134-007-0690-3
