1. Department of Pediatrics, University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany;
2. Department of Pediatric Hematology and Oncology, Hannover Medical School, Hanover, Germany;
3. Institute of Human Genetics, Christian-Albrechts-University Kiel & University Medical Center Schleswig-Holstein, Campus Kiel, Kiel, Germany;
4. Department of Pediatric Hematology and Oncology, Justus Liebig University Giessen, Giessen, Germany;
5. Pediatric Hemato-Oncology and the Cancer Research Center, Sheba Medical Center, Tel Hashomer, Ramat-Gan, Tel Aviv University Medical School, Tel Aviv, Israel; and
6. Medical Research Council Toxicology Unit, Leicester University, Leicester, United Kingdom