VDR and multiple sclerosis: FDE - First Demyelinating Event, CNS - Central Nervous System, GEMS - Genes and Environment in Multiple Sclerosis, EIMS - Epidemiological Investigation of Multiple Sclerosis, NHS - Nurses Health Study, RRMS - Relapsing-Remitting Multiple Sclerosis, VDR - Vitamin D Receptor, GWAS - Genome-Wide Association Studies, IEU - Integrative Epidemiology Unit, NHGRI-EBI - National Human Genome Research Institute-European Bioinformatics Institute