Clinical efficacy and safety of abatacept in methotrexate-naive patients with early rheumatoid arthritis and poor prognostic factors

by Westhovens, R, Robles, M, Ximenes, A C, Nayiager, S, Wollenhaupt, J, Durez, P, Gomez-Reino, J, Grassi, W, Haraoui, B, Shergy, W, Park, S-H, Genant, H, Peterfy, C, Becker, J-C, Covucci, A, Helfrick, R, Bathon, J
Published 2009