Mäkelä, Keijo T, Unto Häkkinen, Mikko Peltola, Miika Linna, Heikki Kröger, and Ville Remes. 2011. “The Effect of Hospital Volume on Length of Stay, Re-Admissions, and Complications of Total Hip Arthroplasty”. Acta Orthopaedica 82 (1):20-26. https://doi.org/10.3109/17453674.2010.533930.