1. Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
2. Division of Research, Kaiser Permanente of Northern California, Oakland, CA, USA
3. Departments of Medicine and Epidemiology & Community Health, University of Minnesota, Minneapolis, MN, USA
4. Department of Medicine, Minneapolis VA Health Care System, Minneapolis, MN, USA
5. Kaiser Permanente Washington Health Research Institute, Seattle, WA, USA
6. Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, USA
7. Department of Family Medicine and Public Health, University of California, San Diego, La Jolla, CA, USA