Johannesdottir, K. B., H. Kehlet, P. B. Petersen, E. K. Aasvang, H. B. D. Sørensen, C. C. Jørgensen, and O. behalf of Centre for Fast-track Hip and Knee Replacement Collaborative Group. “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”. Acta Orthopaedica, vol. 92, Nov. 2021, doi:10.2340/17453674.2021.843.