1. Center for Research on End-of-Life Care and Weill Cornell Medicine, New York, New York, USA.
2. Department of Population Health Sciences, Weill Cornell Medicine, New York, New York, USA.
3. Department of Family Medicine and Community Health, Institute for Health, Healthcare Policy and Aging Research, Rutgers University, New Brunswick, New Jersey, USA.
4. Division of Palliative Medicine and Geriatrics, New York Presbyterian Queens Hospital, Flushing, New York, USA.
5. Department of Medicine, Weill Cornell Medical College, New York, New York, USA.
6. University of Dublin, Trinity College, Dublin, Ireland.
7. Department of Psychiatry, St Michael's House Intellectual Disability Services.