Erratum to: Partial versus Productive Immunoglobulin Heavy Locus Rearrangements in Chronic Lymphocytic Leukemia: Implications for B-Cell Receptor Stereotypy oleh Eugenia Tsakou, Andreas Agathagelidis, Myriam Boudjoghra, Thorsten Raff, Antonis Dagklis, Maria Chatzouli, Tatjana Smilevska, George Bourikas, Helene Merle-Beral, Eleni Manioudaki-Kavallieratou, Achilles Anagnostopoulos, Monika Brüggemann, Frederic Davi, Kostas Stamatopoulos, Chrysoula Belessi