Winther, S. B., O. A. Foss, T. S. Wik, S. P. Davis, M. Engdal, V. Jessen, and O. S. Husby. “1–year follow–up of 920 Hip and Knee Arthroplasty Patients After Implementing fast–track”. Acta Orthopaedica, vol. 86, no. 1, Jan. 2015, pp. 143-4, doi:10.3109/17453674.2014.1002188.