1. Department of Behavioral and Community Health Sciences, University of Pittsburgh School of Public Health, Pittsburgh, PA, USA
2. Center for Social Dynamics and Community Health, University of Pittsburgh School of Public Health, Pittsburgh, PA, USA
3. VA Pittsburgh Healthcare System, Pittsburgh, PA, USA
4. University of Pittsburgh Health Sciences Library System, Pittsburgh, PA, USA
5. School of Public Health, University at Albany, State University of New York, Albany, NY, USA
6. Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA