*Department of Paediatric Haematology Royal Hospital for Sick Children
†Department of Child Life and Health University of Edinburgh
‡Queen Margaret University, Musselburgh
§Department of Haematology, Western General Hospital, Edinburgh, UK
All authors collected the data, which was analyzed by C.K.B. C.K.B. and A.T. drafted the manuscript which was approved by all authors.
The authors declare no conflict of interest.