1. Department of Haematology and Bone Marrow Transplantation, Birmingham Children’s Hospital, Birmingham, United Kingdom;
2. Department of Bone Marrow Transplantation, Great Ormond Street Hospital for Children, London, United Kingdom;
3. Department of Bone Marrow Transplantation, Royal Hospital for Children, Bristol, United Kingdom;
4. Department of Bone Marrow Transplantation, Royal Manchester Children’s Hospital, Manchester, United Kingdom;
5. Department of Bone Marrow Transplantation, Great North Children’s Hospital, Newcastle upon Tyne, United Kingdom;
6. Department of Bone Marrow Transplantation, Royal Marsden Hospital, Sutton, United Kingdom; and
7. Department of Bone Marrow Transplantation, Sheffield Children’s Hospital, Sheffield, United Kingdom