1. Department of Applied Health Research, University College London (UCL), London, UK
2. Centre for Nurse, Midwife and AHP Led Research (CNMAR), University College London Hospitals NHS Foundation Trust, London, UK
3. School of Health Sciences, University of Surrey, Guildford, UK
4. Centre for Outcomes and Experience Research in Children’s Health, Illness and Disability (ORCHID), Great Ormond Street Hospital for Children NHS Foundation Trust (GOSH), London, UK