1. Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Department Youth and Risky Behaviour, room 0.18, Da Costakade 45, 3521 VS Utrecht, The Netherlands, P.O. Box 725, 3500 AS Utrecht, The Netherlands
2. Behavioural Science Institute, Department Developmental Psychopathology, Radboud University, Montessorilaan 3 6525 HR Nijmegen, The Netherlands, P.O. Box 9104, 6500 HE, Nijmegen, The Netherlands
3. Centre for Alcohol Policy Research, Building HS2, Level 5, La Trobe University, Bundoora Victoria 3086, Australia
4. Department of General Social Sciences, Utrecht University, Heidelberglaan 1 3584 CS Utrecht, The Netherlands, P.O. Box 80140, 3508 TC Utrecht, The Netherlands
5. Pluryn, Department Research Development, Industrieweg 50, 6541 TW Nijmegen, The Netherlands, P.O. Box 53 6500 AB Nijmegen, The Netherlands
6. Psychology Department, The REACH Institute, Arizona State University, North Building 900 S. McAllister Ave., Room 205, P.O. Box 876005, Tempe, AZ 85287-6005, USA