1. Harvard Medical School, Boston, Massachusetts, USA.
2. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital/MassGeneral Brigham/Harvard Medical School, Boston, Massachusetts, USA.
3. Center for Clinical Ethics, Yale New Haven Health, New Haven, Connecticut, USA.
4. Department of Neurology, Yale School of Medicine, New Haven, Connecticut, USA.
5. Section of Geriatrics and Palliative Care, Department of Medicine, Veterans Affairs Boston Healthcare System, Boston, Massachusetts, USA.
6. The Ohio State University Nisonger Center, Columbus, Ohio, USA.
7. Division of Palliative Care and Geriatric Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA.
8. Mongan Institute Center for Aging and Serious Illness, Massachusetts General Hospital, Boston, Massachusetts, USA.
9. New England Geriatric Research Education and Clinical Center, Boston Veterans Affairs Boston Healthcare System, Boston, Massachusetts, USA.
10. Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
11. Care Dimensions Hospice, Danvers, Massachusetts, USA.
12. Ross Psychotherapy, Arlington, Massachusetts, USA.
13. Harvard Law School, Cambridge, Massachusetts, USA.
14. Harvard Law School Project on Disability, Cambridge, Massachusetts, USA.
15. Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA.
16. Department of Psychiatry and Behavioral Sciences, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
17. Department of Medicine, Section of General Internal Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts, USA.