Tol, Maria C J M, Nienke W Willigenburg, Hanna C Willems, Taco Gosens, Ariena Rasker, Martin J Heetveld, Martijn G M Schotanus, Johanna M van Dongen, Bart Eggen, Mate Kormos, Stéphanie L van der Pas, Aad W van der Vaart, Rudolf W Poolman, and on behalf of the APOLLO research group. 2022. “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”. Acta Orthopaedica 93 (September):732-38.