1. Oregon Health and Science University, Portland
2. San Francisco Coordinating Center, California
3. Department of Nutritional Sciences and Toxicology, University of California, Berkeley
4. Research Institute, California Pacific Medical Center, San Francisco
5. Departments of Medicine, Epidemiology and Biostatistics, University of California, San Francisco
6. Duke University Medical Center, Durham, North Carolina
7. Department of Epidemiology and Biostatistics, University of California, San Francisco