1. From the Department of Oncology/Haematology, Olga Hospital, Stuttgart; Institute of Paidopathology, University of Kiel, Kiel; Charite-Virchow-Klinikum, Berlin; University Children's Hospital, Düsseldorf; Department of Radiology, University of Regensburg, Regensburg; Department of Oncology/Haematology, University of Tübingen, Tübingen; Department of Radiotherapy, Katharinen Hospital, Stuttgart, Germany; and St Anna Kinderspital, Vienna, Austria.