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Flowchart for article selection according to the PRISMA guidelines regarding the first key question of the SLR: What are the symptoms, objective signs, lab tests, imaging features and other characteristics in patients with ‘newly onset’ adult PsA with a previous diagnosis of PsO? PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses; PsA, psoriatic arthritis; SLR, systematic literature review.
