1. Aberdeen Health Psychology Group (AHPG), Institute of Applied Health Sciences, University of Aberdeen, Health Sciences Building, Foresterhill AB21 2ZD, Aberdeen, UK
2. Amsterdam School of Communication Science (ASCoR), University of Amsterdam, Amsterdam, the Netherlands
3. Department of Health Promotion, Maastricht University, Maastricht, the Netherlands
4. Faculty of Psychology, Open University Netherlands, Heerlen, the Netherlands