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Bergers E, Bot JC, De Groot CJ, Polman CH, Lycklama à Nijeholt GJ, Castelijns JA, van der Valk P, Barkhof F.Bergers E, et al. Among authors: barkhof f.Neurology. 2002 Dec 10;59(11):1766-71. doi: 10.1212/01.wnl.0000036566.00866.26.Neurology. 2002.PMID: 12473766Clinical Trial.