Efficacy of B cell depletion in patients with rheumatoid arthritis refractory to anti-tumour necrosis factor α agents: an open-label observational study. Issue 9 (15th March 2006) - Brulhart, L; Ciurea, A; Finckh, A; Notter, A; Waldburger, J M; Kyburz, D; Gabay, C