Long-term patient survival in ANCA-associated vasculitis - Flossmann, O; Berden, A; De Groot, K; Hagen, C; Harper, L; Heijl, C; Höglund, P; Jayne, D; Luqmani, R; Mahr, A; Mukhtyar, C; Pusey, C; et al. (2011)