A disease-specific activity index for wegener’s granulomatosis: Modification of the birmingham vasculitis activity score. International network for the study of the systemic vasculitides (inssys) - Stone, J H; Hoffman, G S; Merkel, P A; Min, Y I; Uhlfelder, M L; Hellmann, D B; Specks, U; Allen, N B; Davis, J C; Spiera, R F; Calabrese, L H; Wigley, F M; Maiden, N; Valente, R M; Niles, J L; Fye, K H; Mccune, J W; St Clair, E W; Luqmani, R A (Arthritis Rheum, 2001)