P1166: REPEAT BIOPSY IN RELAPSED OR REFRACTORY DIFFUSE LARGE B CELL LYMPHOMA: A NATIONWIDE SURVEY AND RETROSPECTIVE STUDY. (23rd June 2022) - Berger, T.; Geiger, K. R.; Yeshurun, M.; Gafter-Gvili, A.; Shochat, T.; Gurion, R.; Raanani, P.; Pasvolsky, O.