1. Nijmegen Institute for Scientist-Practitioners in Addiction (NISPA), Nijmegen, The Netherlands
2. Victas, Center for Addiction Treatment, Utrecht, The Netherlands
3. Arkin Mental Health, Amsterdam, The Netherlands
4. IrisZorg, Center for Addiction Treatment, Arnhem, The Netherlands
5. NISPA, Nijmegen, The Netherlands
6. Department of Psychiatry, School of Clinical Sciences at Monash Health, Monash University, Victoria, Australia