Ixekizumab, with or without concomitant methotrexate, improves signs and symptoms of PsA: week 52 results from Spirit-P1 and Spirit-P2 studies oleh Bernard Combe, Tsen-Fang Tsai, J. Eugene Huffstutter, Aubrey Trevelin Sprabery, Chen-Yen Lin, So Young Park, Andris Kronbergs, Matthew M. Hufford, Peter Nash