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Seewann A, Kooi EJ, Roosendaal SD, Pouwels PJ, Wattjes MP, van der Valk P, Barkhof F, Polman CH, Geurts JJ.Seewann A, et al.Neurology. 2012 Jan 31;78(5):302-8. doi: 10.1212/WNL.0b013e31824528a0. Epub 2012 Jan 4.Neurology. 2012.PMID: 22218278Free article.