1. Center for Cell and Gene Therapy, Baylor College of Medicine, Methodist Hospital and Texas Children's Hospital, Houston;
2. Novartis Vaccines & Diagnostics, Cambridge, MA;
3. St Jude Children's Research Hospital, Memphis, TN;
4. Dan L. Duncan Cancer Center, Baylor College of Medicine, Houston, TX; and
5. Department of Bone Marrow Transplantation, Great Ormond St Children's Hospital, London, United Kingdom