1. Department of Hematology‐Oncology University of Alabama Birmingham Birmingham Alabama USA
2. Division of Hematology, Oncology, and Stem Cell Transplantation Northwestern University Feinberg School of Medicine Chicago Illinois USA
3. Ann & Robert H. Lurie Children's Hospital of Chicago Chicago Illinois USA
4. bluebird bio, Inc. Somerville Massachusetts USA
5. Cellular and Molecular Therapeutics Branch, National Heart, Lung, and Blood Institute/National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health Bethesda Maryland USA
6. Commissariat à l'énergie atomique et aux énergies alternatives, Institute of Emerging Disease and Innovative Therapies Fontenay‐aux‐Roses France
7. Department of Medicine Brigham & Women's Hospital and Harvard Medical School Boston Massachusetts USA
8. GeneWerk GmbH Heidelberg Germany
9. Division of Hematology University of California San Francisco Benioff Children's Hospital Oakland California USA