Published on in Vol 24, No 5 (2022): May

1 East London NHS Foundation Trust , London , GB
2 Centre for Health Services Research, School of Health Sciences, City, University of London , London , GB
3 Brighton and Sussex University Hospitals NHS Trust , Brighton , GB
4 University College London Great Ormond Street Institute of Child Health, University College London , London , GB
5 Centre for Adolescent Rheumatology Versus Arthritis , London , GB
6 National Institute for Health Research Biomedical Research Centre at Great Ormond Street Hospital , London , GB
7 See Acknowledgments , London , GB
*these authors contributed equally