A 64-year-old man has noted the presence of several lumps on the right side of his neck for the past 5 months. On physical examination he has firm, non-tender, movable lymph nodes palpable in right posterior cervical region. He does not have splenomegaly or hepatomegaly. Laboratory studies show Hgb 11.3 g/dL, Hct 40%, MCV 88 fL, platelet count 256,000/microliter, and WBC count 7230/microliter. A cervical lymph node biopsy is performed and on microscopic examination shows numerous crowded follicles of small, monomorphic lymphocytes. Which of the following is the most likely diagnosis?

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