E. A. Sezgin, O. Robertsson, A. W-Dahl, and L. Lidgren, “Nonagenarians qualify for total knee arthroplasty: a report on 329 patients from the Swedish Knee Arthroplasty Register 2000–2016”, ActaO, vol. 90, no. 1, pp. 53–59, Oct. 2018.