P643: RISK FACTORS FOR UNFAVORABLE OUTCOME OF HOSPITALIZED PANTIENTS WITH CONCURENT CHRONIC LYMPHOCYTIC LEUKEMIA AND COVID-19 – EXPERIENCE OF THREE SERBIAN UNIVERSITY CENTERS. (23rd June 2022) - Cvetkovic, Z.; Markovic, O.; Markovic, K.; Novkovic, A.; Divac, A.; Vukosavljevic, N.; Tanasijevic, M.; Bibic, T.