van der Leeden, Marike, Rutger Dahmen, Jennie Ursum, Leo D. Roorda, Dirkjan van Schaardenburg, Dirk L. Knol, Joost Dekker, and Martijn P.M. Steultjens. 2010. “Prediction of Walking Disability by Disease-Related Factors in Patients With Rheumatoid Arthritis”. Journal of Rehabilitation Medicine 42 (5):506-10. https://doi.org/10.2340/16501977-0551.