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- ↑ Goodin 2012 Neurology
- ↑ Ebers 2010 JNNP
- ↑ Kappos Lancet 2007, Kappos Lancet Neurology 2009, Edan JNNP 2012
- ↑ Shirnai Jama 2012
- ↑ Trojano 2006