1. Child Study Center, Yale University School of Medicine, 230 S. Frontage Road, New Haven, CT 06520-7900, USA
2. Department of Diagnostic Radiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06510, USA
3. Department of Psychology, University of Connecticut, Unit 1020, Storrs, CT 06269-1020, USA
4. Academic Centre for Child and Adolescent Psychiatry, PO Box 660, 9700 AR Groningen, The Netherlands
5. Department of Psychology, Vanderbilt University, 111 21st Avenue, Nashville, TN 37203, USA