1. Division of General Internal Medicine and Primary Care, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
2. Department of Psychosocial Oncology and Palliative Care, Dana Farber Cancer Institute, Boston, Massachusetts, USA.
3. Harvard Medical School, Boston, Massachusetts, USA.
4. Division of Palliative Care and Geriatric Medicine, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA.