Interdependence and contributions of sun exposure and vitamin D to MRI measures in multiple sclerosis. Zivadinov R, Treu CN, Weinstock-Guttman B, Turner C, Bergsland N, O'Connor K, Dwyer MG, Carl E, Ramasamy DP, Qu J, et al. J Neurol Neurosurg Psychiatry. 2013 Feb 5. PMID: 23385850. Abstract CommentRecommendBookmarkWatch