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Tol, M. C. J. M.; Willigenburg, N. W.; Willems, H. C.; Gosens, T.; Rasker, A.; Heetveld, M. J.; Schotanus, M. G. M.; van Dongen, J. M.; Eggen, B.; Kormos, M.; van der Pas, S. L.; van der Vaart, A. W.; Poolman, R. W.; 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 2022, 93, 732-738.