Addition or removal of concomitant methotrexate alters adalimumab effectiveness in rheumatoid arthritis but not psoriatic arthritis. - Behrens, F; Koehm, M; Schwaneck, EC; Schmalzing, M; Wittig, BM; Gnann, H; Greger, G; Tony, H-P; Burkhardt, H; Schwaneck, E C; Wittig, B M (Scandinavian Journal of Rheumatology, 2019)