P09: ATTRITION RATES IN MULTIPLE MYELOMA UNDER REAL WORLD CONDITIONS – AN ANALYSIS FROM THE AUSTRIAN MYELOMA REGISTRY. (5th April 2022) - Benda, MA; Ulmer, H; Weger, R; Winder, T; Hartmann, B; Strassl, Irene; Sormann, Siegfried; Willenbacher, E; Willenbacher, W