Gjertsen, J.-E., Boutera, A., Dyvik, E., & Hallan, G. (2019). Is there a weekend effect after hip fracture surgery? A study of 74,410 hip fractures reported to the Norwegian Hip Fracture Register. Acta Orthopaedica, 91(1), 63–68. https://doi.org/10.1080/17453674.2019.1683945