1. Division of Adolescent and Young Adult Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
2. Division of General Academic Pediatrics, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
3. Rebecca Levenson Consulting, Berkeley, California, USA.
4. Department of Obstetrics, Gynecology & Reproductive Sciences, and Internal Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
5. Division of Emergency Medicine, Children's Mercy, Kansas City, Missouri, USA.
6. Department of Pediatrics, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri, USA.
7. Department of Pediatrics, University of Kansas School of Medicine, Kansas City, Kansas, USA.
8. Futures Without Violence, San Francisco, California, USA.