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Grimaldi, L; Barkhof, F; Beelke, M; Burton, J; Holmoy, T; Hupperts, R; Killetein, J; Rieckmann, P; Schluep, M; Smolders, J; SOLAR, Study Group (2012). A randomized trial of high-dose vitamin D2 in relapsing-remitting multiple sclerosis. Neurology, 78(11), p. 841. Hagerstown, Md.: Lippincott Williams & Wilkins