Kristensen, Morten T, and Henrik Kehlet. “The Basic Mobility Status Upon Acute Hospital Discharge Is an Independent Risk Factor for Mortality up to 5 Years After Hip Fracture Surgery”. Acta Orthopaedica, vol. 89, no. 1, Jan. 2018, pp. 47-52, doi:10.1080/17453674.2017.1382038.