1. Department of Epidemiology, School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
2. Department of Health and Community Systems, School of Nursing, University of Pittsburgh, Pittsburgh, PA, USA
3. Division of General Internal Medicine, University of Utah School of Medicine, Salt Lake City, UT, USA
4. Health Sciences Library System, University of Pittsburgh, Pittsburgh, PA, USA
5. Department of Health Information Management, School of Rehabilitation Science, University of Pittsburgh, Pittsburgh, PA, USA