Performance of Birmingham Vasculitis Activity Score and disease extent index in childhood vasculitides. by Demirkaya, E, Ozen, S, Pistorio, A, Galasso, R, Ravelli, A, Hasija, R, Baskin, E, Dressler, F, Fischbach, M, Garcìa Consuegra, J, Iagaru, N, Pasic, S, Scarpato, S, Rossum, v, Apaz, M, Barash, J, Calcagno, G, Gonzalez, B, Hoppenreijs, E, Ioseliani, M, Mazur-Zielinska, H, Vougiouka, O, Wulffraat, N, Luqmani, R, Martini, A