1. Renal-Electrolyte Division, University of Pittsburgh, Pennsylvania.
2. Center for Health Equity Research and Promotion, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania.
3. Department of Biostatistics, Graduate School of Public Health, University of Pittsburgh, Pennsylvania.
4. Division of General Internal Medicine, University of Pittsburgh, Pennsylvania.
5. Renal Section, VA Pittsburgh Healthcare System, Pittsburgh, Pennsylvania.
6. Section of Palliative Care, University of Pittsburgh, Pennsylvania.