1. Department of Psychiatry; University of North Carolina at Chapel Hill; Chapel Hill NC
2. Division of General Pediatrics and Adolescent Medicine, Department of Pediatrics; University of North Carolina at Chapel Hill; Chapel Hill NC USA
3. Department of Health Policy and Administration; University of North Carolina at Chapel Hill; Chapel Hill NC USA
4. Department of Psychology; University of North Carolina at Chapel Hill; Chapel Hill NC USA
5. Park Dietz & Associates, Inc.; Columbus GA USA
6. Department of Biostatistics; University of North Carolina at Chapel Hill; Chapel Hill NC USA
7. Division of Epidemiology; Norwegian Institute of Public Health; Oslo Norway
8. Division of Mental Health; Norwegian Institute of Public Health; Oslo Norway
9. Department of Psychiatry; University of Oslo; Norway
10. Department of Nutrition; University of North Carolina at Chapel Hill; Chapel Hill NC USA
11. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden