1. Public Health and Primary Care, Institute of Population Health, School of Medicine, Trinity College Dublin, Dublin, Ireland
2. School of Health and Social Care, Edinburgh Napier University, Edinburgh, Scotland
3. Usher Institute and SPECTRUM Consortium, College of Medicine and Veterinary Science, University of Edinburgh, Edinburgh, Scotland
4. Irish Cancer Society, Dublin, Ireland
5. Freelance Researcher, Dublin, Ireland
6. Usher Institute, College of Medicine and Veterinary Science, University of Edinburgh, Edinburgh, Scotland
7. Freelance Researcher, Edinburgh, Scotland
8. HRB Trials Methodology Research Network, School of Nursing & Midwifery, NUI Galway, Galway, Ireland