1. Department of Family Medicine, Oregon Health and Science University, Portland, OR, USA;
2. Division of Biostatistics, School of Public Health, Oregon Health and Science University, Portland State University, Portland, OR, USA;
3. OCHIN, Inc, Portland, OR, USA;
4. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA;
5. The Robert Graham Center for Policy Studies, Washington, DC, USA