QUEST-RA: quantitative clinical assessment of patients with rheumatoid arthritis seen in standard rheumatology care in 15 countries. by Sokka, T, Kautiainen, H, Toloza, S, Mäkinen, H, Verstappen, S, Lund Hetland, M, Naranjo, A, Baecklund, E, Herborn, G, Rau, R, Cazzato, M, Gossec, L, Skakic, V, Gogus, F, Sierakowski, S, Bresnihan, B, Taylor, P, McClinton, C, Pincus, T