Serum 25-Hydroxyvitamin D Levels and Risk of Multiple Sclerosis

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Abstract
Multiple sclerosis (MS) is among the most common neurological diseases in young adults, affecting 350 000 individuals in the United States and 2 million worldwide.1 Prevailing thought is that MS is an autoimmune disorder whereby an unknown agent or agents triggers a T cell–mediated inflammatory attack, causing demyelination of central nervous system tissue.2