Frequency and characteristics of axial involvement in psoriatic arthritis: results from the International Multicentre AXIS Study.

Torgutalp M, Almodovar R, Azevedo VF, Baraliakos X, Bosch FVD, Braun J, Chandran V, Coates LC, Deodhar A, Diekhoff T, Fagni F, Floris A, Gaalen FAV, Garcia-Salinas R, Gensler LS, Goel N, Gottlieb AB, Heijde DV, Helliwell PS, Hermann KGA, Kalyoncu U, Kiltz U, Kynaston-Pearson F, Lambert RG, Laxminarayan R, Leung YY, Llop M, López-Medina C, López-Rodríguez A, Gentiloni MML, Lunteren MV, Magrey M, Maharaj AB, Maldonado-Ficco H, Maksymowych WP, Marzo-Ortega H, Massarotti M, Mathew AJ, Mease P, Nash P, Navarro-Compán V, Østergaard M, Proft F, Protopopov M, Ranza R, Rohekar S, Salvarani C, Schiotis RE, Shenker N, Sieper J, Solmaz D, Soriano ER, Shan Tam L, Toledo RA, Wei JC, Ziade N, Gladman DD, Poddubnyy D