1. Department of Pathology, Hematopathology Section and Lymph Node Registry; University of Kiel/University Hospital Schleswig-Holstein; Kiel Germany
2. Department of Pathology, Queen Mary Hospital; The University of Hong Kong; Hong Kong
3. Pediatric Hematology and Oncology; University of Münster; Münster Germany
4. Pediatric Hematology and Oncology; University Hospital Hamburg-Eppendorf; Hamburg Germany