1. Division of Palliative Care and Pediatrics, Massachusetts General Hospital, Boston, Massachusetts, USA.
2. Harvard Medical School, Boston, Massachusetts, USA.
3. Department of Psychosocial Oncology and Palliative Care, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.
4. Brigham and Women's Hospital, Boston, Massachusetts, USA.
5. Ariadne Labs, Harvard School of Public Health, Brigham and Women's Hospital, Boston, Massachusetts, USA.