A randomized placebo-controlled trial of methotrexate in psoriatic arthritis

Gabrielle H. Kingsley, Anna Kowalczyk, Helen Taylor, Fowzia Ibrahim, Jonathan C. Packham, Neil J. McHugh, Diarmuid M. Mulherin, George D. Kitas, Kuntal Chakravarty, Brian D. M. Tom, Aidan G. O'Keeffe, Peter J. Maddison, David L. Scott