[1]
O. Robertsson, M. Dunbar, K. Knutson, S. Lewold, and L. Lidgren, “Validation of the Swedish Knee Arthroplasty Register: A postal survey regarding 30,376 knees operated on between 1975 and 1995”, ActaO, vol. 70, no. 5, pp. 467–472, Jan. 1999.