Shibata S, Tada Y, Komine M, Hattori N, Osame S, Kanda N, Watanabe S, Saeki H, Tamaki K. Anti-cyclic citrullinated peptide antibodies and IL-23p19 in psoriatic arthritis. Journal of Dermatological Science. 2009 Jan;53(1):34–9. doi: 10.1016/j.jdermsci.2008.06.008.