de Groot, Vincent, Heleen Beckerman, Jos W.R. Twisk, Bernard M. Uitdehaag, Rogier Q. Hintzen, Arjan Minneboo, Gustaaf J. Lankhorst, Chris H. Polman, and Lex M. Bouter. 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):151-57. https://doi.org/10.2340/16501977-0145.