1. Section of Palliative Care, Division of Community Internal Medicine, Geriatrics, and Palliative Care, Departments of Emergency Medicine, and Medicine, Mayo Clinic College of Medicine and Science, Rochester, Minnesota, USA.
2. Palliative Research Center, Section of Palliative Care and Medical Ethics, Division of General Internal Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
3. Section of Palliative Care and Medical Ethics, Division of General Internal Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.