1. Division of Adolescent Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois.
2. Northwestern University, Feinberg School of Medicine, Chicago, Illinois.
3. Division of Epidemiology and Biostatistics, University of Illinois at Chicago School of Public Health, Chicago, Illinois.
4. Chicago Center for HIV Elimination, University of Chicago, Chicago, Illinois.
5. Department of Medicine, University of Chicago, Chicago, Illinois.
6. School of Social Service Administration, University of Chicago, Chicago, Illinois.
7. STI/HIV Intervention Network, University of Chicago, Chicago, Illinois.
8. Department of Public Health Sciences, University of Chicago, Chicago, Illinois.