Kristoffersen, M. H.; Dybvik, E. .; Steihaug, O. M.; Kristensen , T. B.; Engesæter, L. B.; Ranhoff, A. H.; Gjertsen, J.-E. Cognitive Impairment Influences the Risk of Reoperation After Hip Frac- Ture Surgery: Results of 87,573 Operations Reported to the Norwegian Hip Fracture Register. ActaO 2020, 91, 146-151.