1. Division of General Internal Medicine, Department of Medicine, University of California San Francisco , San Francisco, California, USA
2. Center for Vulnerable Populations, Zuckerberg San Francisco General Hospital, University of California San Francisco , San Francisco, California, USA
3. Department of Epidemiology and Biostatistics, University of California San Francisco , San Francisco, California, USA
4. Center for Devices and Radiological Health, U.S. Food and Drug Administration , White Oak, Maryland, USA
5. Office of Minority Health and Health Equity, U.S. Food and Drug Administration , White Oak, Maryland, USA