1. Health Protection Research Unit in Behavioural Science and Evaluation at the University of Bristol, Department of Population Health Sciences Bristol Medical School Bristol UK
2. The National Institute for Health and Care Research Applied Research Collaboration West (NIHR ARC West) at University Hospitals Bristol and Weston NHS Foundation Trust Bristol UK
3. School of Health and Social Wellbeing, Faculty of Health and Applied Sciences University of West England Bristol UK
4. Independent collaborator Belfast United Kingdom of Great Britain and Northern Ireland