B cell synovitis and clinical phenotypes in rheumatoid arthritis: relationship to disease stages and drug exposure by Humby, F, Bugatti, S, Fossati-Jimack, L, Rizvi, H, Lucchesi, D, Lliso-Ribera, G, Nerviani, A, Hands, RE, Giorli, G, Frias, B, Thorborn, G, Jaworska, E, John, C, Goldmann, K, Lewis, MJ, Manzo, A, Bombardieri, M, Pitzalis, C, PEAC-R4RA Investigators