1. Medical Service, Section of Palliative Care, Veterans Affairs Boston Healthcare System, Boston, MA, USA
2. Department of Medicine, Harvard Medical School, Boston, MA, USA
3. Department of Medicine, Boston University School of Medicine, Boston, MA, USA
4. Mental Health Service, Veterans Affairs Boston Healthcare System, Boston, MA, USA
5. Department of Psychiatry, Harvard Medical School, Boston, MA, USA
6. Department of Nursing, Veterans Affairs Boston Healthcare System, Boston, MA, USA
7. Department of Psychiatry, Boston University School of Medicine, Boston, MA, USA