1. Department of Behavioral and Community Health Sciences, School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
2. Center for Social Dynamics and Community Health, School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
3. School of Public Health, University at Albany, State University of New York, Albany, New York, USA
4. Division of Adolescent Medicine, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
5. College of Public Health and Human Sciences, Oregon State University, Corvallis, Oregon, USA