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Johannesdottir, K. B.; Kehlet, H.; Petersen, P. B.; Aasvang, E. K.; Sørensen, H. B. D.; Jørgensen, C. C.; Centre for Fast-track Hip and Knee Replacement Collaborative Group, on behalf of the. Machine Learning Classifiers Do Not Improve Prediction of Hospitalization > 2 Days After Fast-Track Hip and Knee Arthroplasty Compared With a Classical Statistical Risk Model. ActaO 2022, 93, 117-123.