title: Rheumatoid arthritis or psoriatic symmetric polyarthritis? A difficult differential diagnosis.
authors.forename: C
authors.initials: C
authors.lastname: Palazzi
authors.forename: I
authors.initials: I
authors.lastname: Olivieri
authors.forename: A
authors.initials: A
authors.lastname: Petricca
authors.forename: C
authors.initials: C
authors.lastname: Salvarani
mesh_terms: D015535:Arthritis, Psoriatic / Q000175:diagnosis*; D001172:Arthritis, Rheumatoid / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans