Czajka, S., Ziębińska, K., Marczenko, K., Posmyk, B., Szczepańska, A., Krzych, Ł., 2020. Validation of APACHE II, APACHE III and SAPS II scores in in-hospital and one year mortality prediction in a mixed intensive care unit in Poland: a cohort study.. https://doi.org/10.21203/rs.3.rs-24209/v3