title: The challenge of early diagnosis of psoriatic arthritis.
authors.forename: Ignazio
authors.initials: I
authors.lastname: Olivieri
authors.forename: Salvatore
authors.initials: S
authors.lastname: D'Angelo
authors.forename: Angela
authors.initials: A
authors.lastname: Padula
authors.forename: Carlo
authors.initials: C
authors.lastname: Palazzi
mesh_terms: D015535:Arthritis, Psoriatic / Q000145:classification / Q000175:diagnosis*; D042241:Early Diagnosis; D006801:Humans; D012720:Severity of Illness Index