1. ADHDcentraal; Amsterdam The Netherlands
2. Department of Psychiatry, Amsterdam Public Health Research Institute; VU University Medical Center; Amsterdam The Netherlands
3. GGZ inGeest, Amsterdam; The Netherlands
4. Parnassia Psychiatric Institute; The Hague The Netherlands
5. Department of Psychiatry, Leiden University Medical Center; Leiden The Netherlands
6. Collaborative Antwerp Psychiatric Research Institute (CAPRI); University of Antwerp; Antwerp Belgium
7. Department of Clinical Psychology; Leiden University; Leiden The Netherlands