Salvarani, C., I. Olivieri, F. Cantini, A. Marchesoni, L. Punzi, R. Scarpa, and M. Matucci Cerinic. “Recommendations for the Appropriate Use of Anti-TNFα Therapy in Patients With Psoriatic Arthritis”. Reumatismo, vol. 56, no. 3, Sept. 2004, pp. 133-8, doi:10.4081/reumatismo.2004.133.