Gundel, O., Thygesen, L. C., Gögenur, I., & Ekeloef, S. (2019). Postoperative mortality after a hip fracture over a 15-year period in Denmark: a national register study. Acta Orthopaedica, 91(1), 58–62. https://doi.org/10.1080/17453674.2019.1680485