Tol MCJM, Willigenburg NW, Willems HC, Gosens T, Rasker A, Heetveld MJ, Schotanus MGM, van Dongen JM, Eggen B, Kormos M, van der Pas SL, van der Vaart AW, Poolman RW, APOLLO research group on behalf of the. 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 Apr. 19];93:732-8. Available from: https://actaorthop.org/actao/article/view/4547