1. Division of Geriatrics, Department of Medicine, University of California San Francisco, San Francisco, California, USA.
2. Philip R. Lee Institute for Health Policy Studies, University of California San Francisco, San Francisco, California, USA.
3. Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA.
4. Four Seasons Compassion for Life Hospice, Flat Rock, North Carolina, USA.
5. Division of Geriatric Medicine, Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.