1. Department of Primary Care and Public Health, School of Public Health, Imperial College London , London, UK
2. Department of Psychology, University of Waterloo , Waterloo, ON, Canada
3. School of Public Health Sciences, University of Waterloo , Waterloo, ON, Canada
4. Ontario Institute for Cancer Research , Toronto, ON, Canada
5. Health Behavior, Roswell Park Comprehensive Cancer Center , Buffalo, NY, USA
6. Department of Health Promotion (CAPHRI), Maastricht University , Maastricht, The Netherlands
7. Trimbos Institute, Netherlands Expertise Centre for Tobacco Control , Utrecht, The Netherlands