COVID-19 and ANCA-associated vasculitis: recommendations for vaccine preparedness and the use of rituximab. Issue 9 (4th May 2021) - Bruchfeld, Annette; Kronbichler, Andreas; Alberici, Federico; Fervenza, Fernando C; Jayne, David R W; Segelmark, Mårten; Tesar, Vladimir; Szpirt, Wladimir M