S243: ANTIBODY AND T-CELL RESPONSE SIX MONTHS AFTER INITIATION OF BNT162B2 VACCINATION IN PATIENTS WITH MULTIPLE MYELOMA OR CHRONIC LYMPHATIC B-CELL LEUKEMIA COMPARED TO HEALTHY CONTROLS - L. D. Heftdal; L. Pérez-Alós; S. R. Ham; J. R. Madsen; K. Fogh; C. C. Kronborg; A. P. Vallentin; R. B. Hasselbalch; S. R. Ostrowski; R. Frikke-Schmidt; E. Sørensen; L. Hilsted; et al. (HemaSphere, 2022)