Disparities in rheumatoid arthritis disease activity according to gross domestic product in 25 countries in the QUEST-RA database. by Sokka, T, Kautiainen, H, Pincus, T, Toloza, S, da Rocha Castelar Pinheiro, G, Lazovskis, J, Hetland, M, Peets, T, Immonen, K, Maillefert, J, Drosos, A, Alten, R, Pohl, C, Rojkovich, B, Bresnihan, B, Minnock, P, Cazzato, M, Bombardieri, S, Rexhepi, S, Rexhepi, M, Andersone, D, Stropuviene, S, Huisman, M, Sierakowski, S, Karateev, D