1. Tactus Addiction Treatment, Enschede,
2. Department of Psychology, Health and Technology (PHT), Faculty of Behavioural Sciences, University of Twente, Enschede,
3. Nijmegen Institute for Scientist-Practitioners in Addiction (NISPA), Nijmegen,
4. Department of Epidemiology, Medisch Spectrum Twente, Enschede,
5. Department of Research Methodology, Measurement, and Data Analysis, University of Twente, Enschede, and
6. Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, The Netherlands