1. Division of Population Sciences, Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts.
2. Harvard Medical School, Boston, Massachusetts.
3. Ontario Institute for Cancer Research, Toronto, Ontario, Canada.
4. Department of Psychosocial Oncology and Palliative Care, Dana-Farber Cancer Institute, Boston, Massachusetts.
5. Division of Palliative Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts.