1 Vincent Obstetrics & Gynecology Massachusetts General Hospital Harvard Medical School Boston, MA.
2 Public Health Sciences Fred Hutchinson Cancer Research Center Seattle, WA Department of Obstetrics & Gynecology University of Washington Seattle, WA.
3 Department of Medicine Division of Epidemiology and Community Health University of Minnesota Minneapolis, MN Department of Medicine Minneapolis VA Health Care System Minneapolis, MN.
4 Department of Medicine Division of Epidemiology & Community Health University of Minnesota Minneapolis, MN Center for Care Delivery & Outcomes Research Minneapolis VA Health Care System Minneapolis, MN.
5 Department of Family Medicine and Public Health University of California at San Diego La Jolla, CA.
6 Kaiser Permanente Washington Health Research Institute Seattle, WA.
7 Public Health Sciences Fred Hutchinson Cancer Research Center Seattle, WA.