a 30 year-old male noticed a progressively worsening cough for one month. on physical examination, a few small lymph nodes were palpable in the axillae, and the tip of the spleen was palpable. a cbc showed the following: hgb 10.2 g/dl (13-17.3); hct 31.2% (38-52), mcv 90 fl (80-98), wbc count 67,000/microliter (4,000-11,000), and a platelet count of 36,000 (140,000-400,000). a bone marrow exam is performed and seen below. what is his most likely diagnosis?