1. Wellcome-Wolfson Institute for Experimental Medicine, Queen’s University Belfast, Belfast, Ireland
2. School of Health and Society, University of Salford, Manchester, England
3. Alder Hey Children’s NHS Trust, Liverpool, England
4. Birmingham Women’s and Children’s NHS Foundation Trust, Birmingham, England
5. Institute of Applied Health Research, University of Birmingham, Birmingham, England
6. Centre for Public Health, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, Ireland
7. Northern Ireland Clinical Trials Unit, Royal Hospitals, Belfast, Ireland
8. University of Birmingham, Birmingham, England
9. Great Ormond Street Hospital, London, England
10. University College London, Great Ormond Street Institute of Child Health, NIHR Biomedical Research Centre, London, England
11. Leeds Institute for Data Analytics, School of Medicine, University of Leeds, Leeds, England
12. Usher Institute of Population Health Sciences, University of Edinburgh, Edinburgh, Scotland
13. Royal Brompton Hospital, London, England
14. for the SANDWICH Collaborators