1. Department of Medicine, Duke University School of Medicine, Durham, North Carolina.
2. Department of Psychiatry, and Duke University School of Medicine, Durham, North Carolina.
3. Department of Section of Palliative Medicine, Duke University School of Medicine, Durham, North Carolina.
4. Duke Cancer Institute, Duke University, Durham, North Carolina.
5. Duke Fuqua School of Business, Duke University, Durham, North Carolina.
6. Perelman School of Medicine and Palliative and Advanced Illness Research Center, University of Pennsylvania, Philadelphia, Pennsylvania.