1. Division of Adolescent Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois.
2. Department of Psychiatry and Behavioral Sciences, Northwestern University, Feinberg School of Medicine, Chicago, Illinois.
3. Department of Pediatrics, Northwestern University, Feinberg School of Medicine, Chicago, Illinois.
4. Division of Adolescent and Young Adult Medicine, Center for Transyouth Health and Development, Children's Hospital Los Angeles, Los Angeles, California.