1. Institute for Tumor Biology and Experimental Therapy, Georg-Speyer-Haus, Frankfurt, Germany.
2. Division of Hematology/Oncology, Boston Children's Hospital, Boston, Massachusetts.
3. Harvard Medical School, Boston, Massachusetts.
4. Pediatric Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts.
5. Harvard Stem Cell Institute, Harvard University, Boston, Massachusetts.
6. Hannover Medical School, Institute of Experimental Hematology, Hannover, Germany.
7. UCL Great Ormond Street Institute of Child Health, and Great Ormond Street Hospital for Children NHS Trust London, United Kingdom.
8. Genethon, Evry, France.
9. Research Group Gene Modification in Stem Cells, Paul-Ehrlich-Institute, Langen, Germany.
10. Hannover Medical School, Cluster of Excellence REBIRTH, Hannover, Germany.