1. Usher Institute, University of Edinburgh, Edinburgh, UK
2. School of Health, Wellington Faculty of Health, Victoria University of Wellington, Wellington, New Zealand
3. Department of Mathematics and Statistics, University of Strathclyde, Glasgow, UK
4. Public Health Scotland, Glasgow and Edinburgh, UK
5. Centre of Academic Primary Care, University of Aberdeen, Aberdeen, UK
6. School of Medicine, University of St Andrews, St Andrews, UK