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Goeggel Simonetti B, Rafay MF, Chung M, Lo WD, Beslow LA, Billinghurst LL, Fox CK, Pagnamenta A, Steinlin M, Mackay MT; IPSS Study Group.Goeggel Simonetti B, et al.Neurology. 2020 Jan 28;94(4):e337-e344. doi: 10.1212/WNL.0000000000008837. Epub 2019 Dec 19.Neurology. 2020.PMID: 31857436Free PMC article.