Catanoso, M., N. Pipitone, and C. Salvarani. “Epidemiology of Psoriatic Arthritis”. Reumatismo 64, no. 2 (June 5, 2012): 66-70. Accessed June 18, 2019. https://reumatismo.org/index.php/reuma/article/view/reumatismo.2012.66.