1. Prevention Services Division, Colorado Department of Public Health and Environment; Denver Colorado
2. Denver Health; Denver Colorado
3. University of Colorado Denver; Aurora Colorado
4. Cancer Therapy and Research Center; University of Texas Health Science Center; San Antonio Texas
5. University of Virginia; Charlottesville Virginia
6. Institute for Clinical Research and Health Policy Studies; Tufts Medical Center and Tufts University School of Medicine; Boston Massachusetts
7. Division of Cancer Prevention and Control, Department of Internal Medicine; Ohio State University; Columbus Ohio
8. Division of Epidemiology; Ohio State University; Columbus Ohio
9. Comprehensive Cancer Center; Ohio State University; Columbus Ohio
10. George Washington Cancer Institute; Washington DC
11. Duke Cancer Institute; Durham North Carolina
12. Department of Obstetrics and Gynecology, Feinberg School of Medicine; Northwestern University; Chicago Illinois
13. Department of Preventive Medicine, Feinberg School of Medicine; Northwestern University; Chicago Illinois
14. Robert H. Lurie Comprehensive Cancer Center; Northwestern University; Chicago Illinois
15. Northwest Portland Area Indian Health Board, Northwest Tribal Epidemiology Center; Portland Oregon
16. Clinical Research Services, NOVA Research Company; Bethesda Maryland