OC.01.1 CIRCULATING TOTAL AND IGG4+ PLASMABLASTS FOR THE DIAGNOSIS OF TYPE 1 AIP. (May 2022) - Gabrieletto, E.M.; De Marchi, G.; Adamo, A.; Zuliani, V.; Ugel, S.; Bobba, V.; Marconato, E.; Krampera, M.; Frulloni, L.