1. Department of Pediatrics; University Medical Center Schleswig-Holstein; Kiel Germany
2. Children's Cancer Research Institute, St. Anna Kinderkrebsforschung; Vienna Austria
3. Department of Pediatric Hematology and Oncology; Hannover Medical School; Hannover Germany
4. Institute of Human Genetics; Christian-Albrechts-University Kiel & University Medical Center Schleswig-Holstein; Kiel Germany
5. Institute of Human Genetics; University of Ulm; Ulm Germany