1. Amsterdam UMC, Amsterdam Public Health Research Institute and Department of Epidemiology and Biostatistics, VU University Medical Center, Amsterdam, The Netherlands
2. Amsterdam UMC, Amsterdam Public Health Research Institute and Department of Epidemiology and Biostatistics, VU University Medical Center, Amsterdam, The Netherlands/Netherlands Organisation for Applied Scientific Research (TNO), Leiden, The Netherlands
3. National MS Center Melsbroek, Melsbroek, Belgium/Center for Neurosciences and Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel (VUB), Brussel, Belgium
4. Amsterdam UMC, Department of Neurology, VU University Medical Center, Amsterdam, The Netherlands