1. Methodist Neurological InstituteHouston TX
2. Department of NeurologyWeill Cornell Medical CollegeNew York NY
3. Generation R Study GroupRotterdam the Netherlands
4. Department of Child and Adolescent PsychiatryErasmus University Medical CenterRotterdam the Netherlands
5. Department of EpidemiologyErasmus University Medical CenterRotterdam the Netherlands
6. Department of EndocrinologyErasmus University Medical CenterRotterdam the Netherlands
7. Department of PediatricsErasmus University Medical CenterRotterdam the Netherlands
8. Department of Internal MedicineErasmus University Medical CenterRotterdam the Netherlands
9. Department of Clinical ChemistryErasmus University Medical CenterRotterdam the Netherlands
10. Department of PsychiatryErasmus University Medical CenterRotterdam the Netherlands