1. Division of General Internal Medicine, Department of Medicine, University of California, San Francisco, CA, USA
2. Department of Public Health Sciences, University of California, Davis, CA, USA
3. Division of Hematology and Oncology, Department of Internal Medicine, University of California, Davis, CA, USA
4. Department of Health Policy and Management, University of California, Los Angeles, CA, USA
5. Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, USA