1. Research Institute; San Francisco Coordinating Center; California Pacific Medical Center; San Francisco California
2. Department of Epidemiology; University of Pittsburgh; Pittsburgh Pennsylvania
3. Department of Family and Preventive Medicine; University of California at San Diego; San Diego California
4. Portland Veterans Affairs Medical Center; Portland Oregon
5. Department of Medicine; Stanford University; Stanford California
6. Department of Epidemiology; University of California at San Francisco; San Francisco California
7. Medical Center; University of California at Davis; Sacramento California
8. Department of Medicine; University of Minnesota; Minneapolis Minnesota
9. Minneapolis Veterans Affairs Health System; Minneapolis Minnesota
10. School of Medicine; Oregon Health & Science University; Portland Oregon