1. California Department of Public Health, Richmond, California, USA
2. University of Cincinnati College of Medicine, Cincinnati, Ohio, USA
3. Impact Assessment Inc., La Jolla, California, USA
4. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. Kaiser Permanente, San Francisco, California, USA
6. Department of Public Health Sciences, University of California, Davis, Davis, California, USA
7. Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California, USA
8. Division of Research, Kaiser Permanente, Oakland, California, USA