1. Childhood Leukemia Research Section, Department of Pediatric Oncology and the Cancer Research Center, Edmond and Lily Safra Children Hospital and Sheba Medical Center, Tel Hashomer, Ramat Gan, Israel;
2. Department of Human Molecular Genetics and Biochemistry, Tel Aviv University, Tel Aviv, Israel;
3. The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer Sheva, Israel;
4. Department of Cell and Developmental Biology, Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel;
5. Department of Medicine and Stem Cell Institute, University of Minnesota, Minneapolis, MN;
6. Ocular Oncology Service, Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel;
7. Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, Ulm, Germany;
8. Department of Pediatrics, University Hospital Schleswig Holstein, Kiel, Germany;
9. Department of Pediatric Pathology, University Hospital Schleswig Hostein, Kiel, Germany;
10. Department of Pediatric Oncology/Hematology, Charité Universitäts Medizin Berlin, Berlin, Germany;
11. Department of Pediatric Oncology, Hannover Medical School, Hannover, Germany;
12. The Research Institute of Fox Chase Cancer Center, Philadelphia, PA; and
13. Tissue Typing Laboratory and National Laboratory for Solid Organ Transplants, Sheba Medical Center, Ramat Gan, Israel