title: Defining the differences.
authors.forename: J J
authors.initials: JJ
authors.lastname: Sciubba
mesh_terms: D006801:Humans; D012859:Sjogren's Syndrome / Q000145:classification* / Q000473:pathology; D014985:Xerophthalmia / Q000473:pathology; D014987:Xerostomia / Q000473:pathology