1. Faculty of Health Sciences and Sport, University of Stirling, Stirling, UK
2. Centre for Adolescent and Child Health Research, School of Medicine, University of St Andrews, St Andrews, UK
3. Institute for Social Marketing, Faculty of Health Sciences and Sport, University of Stirling, Stirling, UK
4. Institute of Geography, School of GeoSciences, University of Edinburgh, Edinburgh, UK
5. ScotCen Social Research, Edinburgh, UK
6. Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK
7. School of Medicine, Medical & Biological Sciences, University of St Andrews, St Andrews, UK