1 Department of Pathology, Haematopathology Section and Lymph Node Registry, University of Kiel/University Hospital Schleswig-Holstein, Kiel, Germany.
2 Department of Pathology, the University of Hong Kong, Queen Mary Hospital, Hong Kong, Hong Kong.
3 Clinic of Pediatric Hematology and Oncology, University Hospital Münster, Münster, Germany.
4 Department of Pediatric Hematology and Oncology, Hannover Medical School, Hannover, Germany.
5 Clinic for Pediatric Hematology and Oncology, University Hospital Hamburg-Eppendorf, Hamburg, Germany.
6 Department of Pathology, Haematopathology Section and Lymph Node Registry, University of Kiel/University Hospital Schleswig-Holstein, Kiel, Germany. wklapper@path.uni-kiel.de.