1. School of Health Sciences, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK
2. University College London Hospital NHS Foundation Trust, London, UK
3. Department of Nursing and Midwifery, University of the West of England, Bristol, UK
4. Evelina London Children’s Hospital, St Thomas’ Hospital, Westminster Bridge Road, London, UK
5. Royal College of Paediatrics and Child Health, London, UK
6. Centre for Outcomes and Experiences Research in Children’s Health, Illness and Disability, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK