1. Department of Psychiatry and Behavioral Sciences George Washington University Medical Center, Washington, DC
2. Department of Pediatrics, George Washington University Medical Center, Washington, DC
3. Department of Pediatrics, Harvard Medical School Boston, Massachusetts
4. Adolescent/Young Adult Medicine, Children's Hospital, Boston, Massachusetts
5. Department of Society, Human Development, and Health and the Center on Media and Child Health, Harvard School of Public Health, Boston, Massachusetts