EULAR points to consider in the development of classification and diagnostic criteria in systemic vasculitis. by Basu, N, Watts, R, Bajema, I, Baslund, B, Bley, T, Boers, M, Brogan, P, Calabrese, L, Cid, M, Cohen-Tervaert, J, Flores-Suarez, L, Fujimoto, S, de Groot, K, Guillevin, L, Hatemi, G, Hauser, T, Jayne, D, Jennette, C, Kallenberg, C, Kobayashi, S, Little, M, Mahr, A, McLaren, J, Merkel, P, Ozen, S