de Groot, V., Beckerman, H., Twisk, J. W., Uitdehaag, B. M., Hintzen, R. Q., Minneboo, A., … Bouter, L. M. (2008). Vitality, perceived social support and disease activity determine the performance of social roles in recently diagnosed multiple sclerosis: a longitudinal analysis. Journal of Rehabilitation Medicine, 40(2), 151–157. https://doi.org/10.2340/16501977-0145