1. Bradford Teaching Hospitals NHS Foundation Trust, Bradford, United Kingdom.
2. Cancer Division, University College London Hospitals NHS Foundation Trust, London, United Kingdom.
3. School of Health Sciences, University of Surrey, Guildford, United Kingdom.
4. Centre for Outcomes and Experiences Research in Children's Health, Illness and Disability (ORCHID), Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom.
5. School of Health and Social Care, London South Bank University, London, United Kingdom.