Poolman, R. W. ., L. W. A. H. V. Beers, B. C. H. V. D. Wal, T. G. V. Loon, D. J. F. Moojen, M. F. V. . Wier, A. D. . Klaassen, and N. W. Willigenburg. “Study Protocol: Effectiveness of Dual-Mobility Cups Compared With Uni-Polar Cups for Preventing Dislocation After Primary Total Hip Arthroplasty in Elderly Patients — Design of a Randomized Controlled Trial Nested in the Dutch Arthroplasty Registry”. Acta Orthopaedica, vol. 91, no. 5, Aug. 2020, pp. 514–519, doi:10.1080/17453674.2020.1798658.