1. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
2. Division of Adolescent and Young Adult Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
3. Division of General Academic Pediatrics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
4. Department of Obstetrics, Gynecology, & Reproductive Sciences, and Internal Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
5. Futures Without Violence, San Francisco, California, USA.