1. Paediatric Intensive Care Unit, Bristol Royal Hospital for Children, Bristol, United Kingdom
2. Centre for Outcomes and Experience Research in Children’s Health, Illness and Disability, Great Ormond Street Hospital, London, United Kingdom
3. Children’s Acute Transport Service, Great Ormond Street Hospital, London, United Kingdom
4. Institute of Child Health, University College London, London, United Kingdom
5. Faculty of Health, University of the West of England, Bristol, United Kingdom
6. Department of Paediatric Intensive Care, University Hospital Southampton, Southampton, United Kingdom
7. Critical Care and Cardiorespiratory Division, Great Ormond Street Hospital, London, United Kingdom
8. NIHR Biomedical Research Centre, Great Ormond Street Hospital, London, United Kingdom