Tol MCJM, Willigenburg NW, Willems HC, Gosens T, Rasker A, Heetveld MJ, et al. Posterolateral or direct lateral approach for cemented hemiarthroplasty after femoral neck fracture (APOLLO): protocol for a multicenter randomized controlled trial with economic evaluation and natural experiment alongside. ActaO [Internet]. 2022 Sep. 12 [cited 2024 Nov. 23];93:732-8. Available from: https://actaorthop.org/actao/article/view/4547