1. Royal Aberdeen Children’s Hospital, University of Aberdeen, Aberdeen, UK
2. Health Services Research Unit, University of Aberdeen, Aberdeen, UK
3. Medical Statistics Team, University of Aberdeen, Aberdeen, UK
4. Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK
5. Health Economics Research Unit, University of Aberdeen, Aberdeen, UK
6. Edinburgh Clinical Trials Unit, University of Edinburgh, Edinburgh, UK
7. Leicester NIHR Biomedical Research Centre, University of Leicester, Leicester, UK
8. Erasmus University Medical Centre, Rotterdam, the Netherlands
9. Primary Care and Population Sciences, University of Southampton, Southampton, UK
10. Observational and Pragmatic Research Institute, Singapore
11. Centre of Academic Primary Care, University of Aberdeen, Aberdeen, UK