1. School of Medicine, University of California, San Francisco, CA, USA
2. Division of General Internal Medicine, Department of Medicine, University of California, San Francisco, CA, USA
3. Division of General Internal Medicine at Zuckerberg San Francisco General Hospital, University of California, San Francisco, CA, USA
4. UCSF Center for Vulnerable Populations, Zuckerberg San Francisco General Hospital, San Francisco, CA, USA
5. Division of Geriatrics, Department of Medicine, University of California, San Francisco, CA, USA
6. San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA
7. Health Sciences Library System, University of Pittsburgh, PA, USA
8. Section of Palliative Care and Medical Ethics, Division of General Internal Medicine, University of Pittsburgh, Pittsburgh, PA, USA