1. Division of General Internal Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.
2. Department of Health Policy and Management, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
3. School of Nursing, University of Alabama at Birmingham, Birmingham, Alabama.
4. Department of Medicine, University of Toronto, Toronto, Ontario, Canada.
5. Health Sciences Library System, University of Pittsburgh, Pittsburgh, Pennsylvania.
6. Section of Palliative Care and Medical Ethics, Division of General Internal Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.