1. Cellular and Molecular Therapeutics Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD;
2. bluebird bio, Inc, Cambridge, MA;
3. GeneWerk GmbH, Heidelberg, Germany;
4. Division of Hematology and Oncology, University of Alabama at Birmingham, Birmingham, AL;
5. University of California San Francisco Benioff Children’s Hospital, Oakland, CA;
6. Division of Hematology, Oncology and Stem Cell Transplant, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, IL; and
7. Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL