1. John A. Burns School of Medicine; Department of Pediatrics; University of Hawaii; Honolulu USA
2. Department of Woman and Child Health; University of Padova; Padova Italy
3. IRP-Istituto di Ricerca Pediatrica-Cittàdella Speranza; Padova Italy
4. Department of Paediatric Haematology and Oncology; Justus-Liebig-University; Giessen Germany
5. Department of Paediatric Haematology and Oncology; Non-Hodgkin Lymphoma-Berlin-Frankfurt-Münster Study Centre; Justus-Liebig University; Giessen Germany
6. Department of Pathology; Haematopathology Section; University-Hospital Schleswig-Holstein; University of Kiel; Kiel Germany