Association Between Changes in BLyS Levels and the Composition of B and T Cell Compartments in Patients With Refractory Systemic Lupus Erythematosus Treated With Belimumab oleh Francesca Regola, Francesca Regola, Silvia Piantoni, Silvia Piantoni, Torsten Lowin, Silvia Archetti, Rossella Reggia, Rajesh Kumar, Franco Franceschini, Franco Franceschini, Paolo Airò, Angela Tincani, Angela Tincani, Laura Andreoli, Laura Andreoli, Georg Pongratz