1. Division of General Internal Medicine, Section of Palliative Care and Medical Ethics, University of Pittsburgh, Pittsburgh, PA.
2. Palliative Research Center, University of Pittsburgh, Pittsburgh, PA.
3. Division of Respirology, Department of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada.
4. Department of Medicine, University of Chicago, Chicago, IL.
5. MacLean Center for Clinical Medical Ethics, University of Chicago, Chicago, IL.
6. Department of Pulmonary and Critical Care, University of Chicago, Chicago, IL.