Irmola, T.; Ponkilainen, V.; Mäkelä, K. T.; Robertsson, O.; W-Dahl, A.; Furnes, O.; Fenstad, A. M.; Pedersen, A. B.; Schrøder, H. M.; Niemeläinen, M. J.; Eskelinen, A. Impact of Nordic Arthroplasty Register Association (NARA) Collaboration on Demographics, Methods and Revision Rates in Knee Arthroplasty: A Register-Based Study from NARA 2000–2017. ActaO 2022, 93, 866–873.