Persistent polyclonal B-cell lymphocytosis: extensively proliferated CD27+IgM+IgD+ memory B cells with a distinctive immunophenotype. - Berkowska MA; Grosserichter-Wagener C; Adriaansen HJ; de Ridder D; Mirani-Oostdijk KP; Agteresch HJ; Böttcher S; Orfao A; van Dongen JJ; van Zelm MC (Leukemia, 2014)