Robert Wynn is Professor of Paediatric Haematology at the University of Manchester, and Consultant Paediatric Haematologist and Director of the Paediatric Blood and Marrow Transplant Programme at the Royal Manchester Children's Hospital. Rukhmi Bhat is Assistant Professor of Pediatrics at the Feinberg School of Medicine, Northwestern University, Illinois, and Attending Physician in Hematology/Oncology/Stem Cell Transplant at the Ann and Robert H. Lurie Children's Hospital, Chicago. Paul Monagle is Stevenson Professor and Head of the Department of Paediatrics at the University of Melbourne, and Former Director of the Department of Haematology at the Royal Children's Hospital, Melbourne.