1. Department of Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
2. Department of Child and Adolescent Psychiatry and Rudolf Magnus Institute for Neuroscience, University Medical Center Utrecht, Utrecht, The Netherlands.
3. Department of Clinical Pharmacy, Wilhelmina Hospital Assen, Assen, The Netherlands.
4. Division of Pharmacoepidemiology and Pharmacotherapy, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Utrecht, The Netherlands.
5. Department of Psychiatry, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
6. Child Study Center, Yale University School of Medicine, New Haven, Connecticut.