FOXP3 expression in blood, synovial fluid and synovial tissue during inflammatory arthritis and intra-articular corticosteroid treatment. Dahkki Raghavan, S, Cao, D, Widhe, M, Roth, K, Herrath, J, Engström, M, Roncador, G, Banham, A, Trollmo, C, Catrina, A, Malmström, V