1. Department of Medicine, University of Washington, Seattle, WA, USA
2. Department of Family Medicine, University of Washington, Seattle, WA, USA
3. School of Nursing, University of Washington, Seattle, WA, USA
4. Department of Epidemiology, University of Washington, Seattle, WA, USA
5. National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA