1. Harvard Medical School, Boston, Massachusetts.
2. Department of Statistics, Harvard University, Boston, Massachusetts.
3. Center for Psycho-Oncology and Palliative Care Research, Dana-Farber Cancer Institute, Boston, Massachusetts.
4. Department of Psycho-Oncology and Palliative Care, Dana-Farber Cancer Institute, Boston, Massachusetts.
5. Harvard Medical School Center for Palliative Care, Boston, Massachusetts.
6. Department of Radiation Oncology, Boston Medical Center, Boston, Massachusetts.
7. Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts.
8. Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts.
9. Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts.