1. Department of Orthopedagogics, Ghent University, H. Dunantlaan 2, 9000 Ghent, Belgium
2. Center for Interventions, Treatment and Addictions Research (CITAR), Boonshoft School of Medicine, Wright State University, 3640 Colonel Glenn Highway, Dayton, OH 45435, USA
3. Oxfordshire Complex Needs Service, Oxfordshire and Buckinghamshire Mental Health NHS Foundation Trust, Manzil Way, Oxford OX4 1XE, UK
4. Faculty of Education, Health and Social Work, Ghent University College, Voskenslaan 362, B-9000 Ghent, Belgium