1. School of Public Health; University of Washington; Seattle Washington
2. Division of Epidemiology; University of California San Diego; San Diego California
3. Department of Family and Preventive Medicine; University of California San Diego; San Diego California
4. Fred Hutchinson Cancer Research Center; Seattle Washington
5. Group Health Research Institute; Group Health Cooperative; Seattle Washington
6. School of Pharmacy; University of Washington; Seattle Washington
7. Los Angeles Biomedical Research Institute; Harbor-UCLA Medical Center; Torrance California
8. Mayo Clinic College of Medicine; Mayo Clinic Arizona; Scottsdale Arizona