1. Section of General Internal Medicine, Department of Medicine; Boston University School of Medicine; Boston Massachusetts
2. Nova Research Company; Bethesda Maryland
3. College of Public Health; The Ohio State University; Columbus Ohio
4. School of Public Health; University of Illinois at Chicago; Chicago Illinois
5. Department of Obstetrics and Gynecology; University of Virginia; Charlottesville Virginia
6. Duke Cancer Institute; Duke University School of Medicine; Durham North Carolina
7. Department of Family Medicine; University of Rochester; Rochester New York
8. Colorado School of Public Health; University of Colorado at Denver; Denver Colorado
9. Department of Obstetrics and Gynecology; Northwestern University Feinberg School of Medicine; Chicago Illinois
10. Northwest Portland Area Indian Health Board; Northwest Tribal Epidemiology Center; Portland Oregon