Nomenclature of systemic vasculitides: proposal of an international conference - Jennette, JC; Falk, RJ; Andrassy, K; Bacon, PA; Churg, J; Gross, WL; Hagen, EC; Hoffmann, GS; Hunder, GG; Kallenberg, CGM; Me Cluskey, RT; Sinico, RA; Rees, AJ; van Es, LA; Waldherr, R; Wiik, A (Arthritis Rheum, 1994)