Clinical outcome and B cell depletion in patients with rheumatoid arthritis receiving rituximab monotherapy in comparison with patients receiving concomitant methotrexate. Issue 11 (14th October 2008) - Owczarczyk, K; Hellmann, M; Fliedner, G; Röhrs, T; Maizus, K; Passon, D; Hallek, M; Rubbert, A