1. Oregon State University Hallie E. Ford Center and Health Promotion and Health Behavior Program, College of Public Health and Human Sciences, Corvallis, Oregon, USA
2. University of California San Francisco, Department of Epidemiology and Biostatistics, San Francisco, California, USA
3. Portland State University, School of Social Work and School of Public Health, Portland, Oregon, USA
4. The Henne Group, San Francisco, California, USA