1. Department of Psychiatry, Section Medical Psychology, Erasmus University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands
2. Department of Psychiatry and Child & Adolescent Psychiatry, Erasmus University Medical Center, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands
3. Beval Beter, P.O. Box 345, 1000 AH Amsterdam, The Netherlands