FCER2 and hairy cell leukemia: Comparison of key immunophenotypic markers (CD5, CD10, CD23, CD25, CD103, cyclin D1) to differentiate chronic lymphocytic leukemia (CLL), mantle cell lymphoma (MCL), follicular lymphoma (FL), hairy cell leukemia (HCL), and splenic diffuse red pulp lymphoma (SDRPL).