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Treatment type by year of initiation. IV chemo-only intravenous chemotherapy only, F fludarabine containing subset of IV chemo-only, R-mono rituximab monotherapy, R + IV chemo rituximab plus intravenous chemotherapy, R + F fludarabine containing subset of R + IV chemo, CLB chlorambucil. Note: Part D chlorambucil data available for 2007–2009 only
