1. Division of General Internal Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA;
2. Division of General Internal Medicine, University of California San Francisco, San Francisco, California, USA;
3. Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania, USA;
4. University of Colorado School of Medicine, Office of the Dean, Denver, Colorado, USA;
5. Division of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA