Lohmander, L Stefan, Lars Birger Engesæter, Peter Herberts, Thorvaldur Ingvarsson, Ulf Lucht, and Timo J S Puolakka. 2006. “Standardized Incidence Rates of Total Hip Replacement for Primary Hip Osteoarthritis in the 5 Nordic Countries: Similarities and Differences”. Acta Orthopaedica 77 (5):733-40. https://doi.org/10.1080/17453670610012917.