1. Health Psychology Group, Institute of Applied Health SciencesUniversity of Aberdeen, Aberdeen, UK
2. Radboud University Medical Center, Radboud Institute for Health Sciences, IQ Healthcare, Nijmegen, the Netherlands
3. National Drug and Alcohol Research Centre, University of New South Wales, Sydney, Australia
4. Department of Psychiatry and NeuropsychologySchool for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands
5. Department of Clinical Psychology and Experimental Psychopathology, University of Groningen, Groningen, the Netherlands
6. Nuffield Department of Primary Care Health Sciences and National Institute of Health Research Oxford Biomedical Research Centre, University of Oxford, Oxford, UK
7. Institute of Mental HealthSchool of Psychology, University of Birmingham, Birmingham, UK
8. Department of Behavioural Science and Health, University College London, London, UK
9. Centre for Behaviour Change, University College London, London, UK