P905: IXAZOMIB-THALIDOMIDE-DEXAMETHASONE INDUCTION FOLLOWED BY IXAZOMIB OR PLACEBO MAINTENANCE IN NON-TRANSPLANT ELIGIBLE NEWLY DIAGNOSED MULTIPLE MYELOMA PATIENTS; LONG-TERM RESULTS OF HOVON-126/NMSG 21.13. (23rd June 2022) - Groen, K.