1. Division of Palliative Care and Geriatric Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA.
2. Harvard Medical School, Boston, Massachusetts, USA.
3. Department of Medicine, Section of Palliative Care, Stanford University, Stanford, California, USA.
4. Department of Psychiatry and Medicine, Joan and Sanford I. Weill Medical College of Cornell University, New York, New York, USA.
5. No institutional affiliation.
6. Visiting Nurse Service of New York, New York, New York, USA.