FP190LONG TERM OUTCOME OF PATIENTS WITH ANCA ASSOCIATED VASCULITIS AND SEVERE RENAL INVOLVEMENT TREATED WITH RITUXIMAB AND LOW-DOSE CONVENTIONAL IMMUNOSUPRESSION. (18th May 2018) - Marinaki, Smaragdi; Skalioti, Chrysanthi; Kapsia, Eleni; Kalaitzakis, Emmanouil; Xagas, Efstathios; Vallianou, Kalliopi; Boletis, John