Association of seasonal serum 25-hydroxyvitamin D levels with disability and relapses in relapsing-remitting multiple sclerosis. Brola W, Sobolewski P, Szczuchniak W, Góral A, Fudala M, Przybylski W, Opara J Eur J Clin Nutr. 2016 Mar 30. PMID: 27026420. Abstract CommentRecommendBookmarkWatch