title: On the postulated co-existence of rheumatoid arthritis and psoriatic arthritis.
authors: P S
authors: PS
authors: Helliwell
authors: V
authors: V
authors: Wright
mesh_terms: D015535:Arthritis, Psoriatic / Q000150:complications*; D001172:Arthritis, Rheumatoid / Q000150:complications*; D006801:Humans