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Chronic cerebrospinal venous insufficiency is not associated with cognitive impairment in multiple sclerosis

Ralph HB Benedict*, Bianca Weinstock-Guttmam, Karen Marr, Vesela Valnarov, Cheryl Kennedy, Ellen Carl, Christina Brooks, David Hojnacki and Robert Zivadinov

BMC Medicine 2013, 11:167  doi:10.1186/1741-7015-11-167

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