1. Veale D, Fitzgerald O (2002) Psoriatic arthritis. Best Pract Res Clin Rheumatol 16:523–535
2. Veale DJ, Fitzgerald O (2002) Psoriatic arthritis—pathogenesis and epidemiology. Clin Exp Rheumatol 20(Suppl. 28):S27–S33
3. Gladman DD, Antoni C, Mease P, Clegg DO, Nash P (2005) Psoriatic arthritis: epidemiology, clinical features, course and outcome. Ann Rheum Dis 64(Suppl II):ii14–ii17
4. Alenius GN, Stenberg B, Stenlund H, Lundbland M, Dahlqvist SR (2002) Inflammatory joint manifestations are prevalent in psoriasis: prevalence study of joint and axial involvement in psoriatic patients, and evaluation of psoriatic and arthritic questionnaire. J Rheumatol 29:2577–2582
5. Fitzgerald O, Dougados M (2006) Psoriatic arthritis: one or more diseases? Best Pract Res Clin Rheumatol 20:435–450