1. Health Psychology Group, Institute of Applied Health Sciences, University of Aberdeen, Health Sciences Building, Foresterhill Campus, Aberdeen, UK
2. Department of Psychology, School of Social Sciences, Nottingham Trent University, Nottingham, UK
3. Scottish Dental Clinical Effectiveness Programme, NHS Education for Scotland, Dundee Dental Education Centre, Dundee, UK
4. Department of Clinical Psychology and Experimental Psychopathology, University of Groningen, Groningen, The Netherlands
5. Centre for Behaviour Change, University College London, London, UK
6. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
7. Health Behaviour Research Centre, Department of Epidemiology and Public Health, University College London, London, UK
8. Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Maastricht University, Maastricht, The Netherlands