Espehaug, Birgitte, Leif I Havelin, Lars B Engesaeter, and Stein E Vollset. “The Effect of Hospital-Type and Operating Volume on the Survival of Hip Replacements: A Review of 39,505 Primary Total Hip Replacements Reported to the Norwegian Arthroplasty Register, 1988-1996”. Acta Orthopaedica 70, no. 1 (January 1, 1999): 12–18. Accessed February 23, 2025. https://actaorthop.org/actao/article/view/20359.