Havelin, Leif I, Birgitte Espehaug, Stein E Vollset, Lars B Engesæter, and Norvald Langeland. “The Norwegian Arthroplasty Register: A Survey of 17,444 Hip Replacements 1987–1990”. Acta Orthopaedica 64, no. 3 (January 1, 1993): 245–251. Accessed February 23, 2025. https://actaorthop.org/actao/article/view/21716.