1. Section of Palliative Medicine, Division of General Medicine, Departments of Emergency Medicine and Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.
2. Section of Palliative Care, Department of Medicine, Stanford University Medical Center, Stanford University School of Medicine, Stanford, California, USA.
3. Department of Neurology, Harvard Medical School, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.
4. Division of Palliative Medicine, Departments of Emergency Medicine and Family and Preventative Medicine, Grady Memorial Hospital, Emory School of Medicine, Atlanta, Georgia, USA.