title: The prevalence of Sjögren syndrome in patients with primary progressive multiple sclerosis.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Fox
mesh_terms: D000328:Adult; D000368:Aged; D006801:Humans; D008875:Middle Aged; D020528:Multiple Sclerosis, Chronic Progressive / Q000453:epidemiology*; D015995:Prevalence; D012859:Sjogren's Syndrome / Q000453:epidemiology*