1. SWOG Statistics and Data Management Center , Seattle, WA, USA
2. Fred Hutchinson Cancer Center , Seattle, WA, USA
3. Idaho State University , Pocatello, ID, USA
4. Division of Cancer Prevention, National Cancer Institute, Community Oncology and Prevention Trials Group , Rockville, MD, USA
5. Friends of Cancer Research , Washington, DC, USA
6. The University of Texas MD Anderson Cancer Center , Houston, TX, USA
7. Pfizer Oncology, Inc , New York, NY, USA
8. SWOG Data Operations Center, Cancer Research and Biostatistics , Seattle, WA, USA
9. Cookeville Regional Medical Center, Southeast NCORP , Cookeville, TN, USA
10. Veterans Affairs Connecticut Healthcare System, Yale University School of Medicine, Massachusetts Veterans Epidemiology Research and Information Center , New Haven, CT, USA
11. University Health Truman Medical Center, University of Kansas Cancer Center—Midwest Cancer Alliance Rural MU National Cancer Institute Community Oncology Research Program , Kansas City, MO, USA
12. University of Pittsburgh Medical Center Hillman Cancer Center , Pittsburgh, PA, USA
13. Duke Cancer Institute , Durham, NC, USA
14. H. Lee Moffitt Cancer Center and Research Institute , Tampa, FL, USA
15. University of California Davis Comprehensive Cancer Center , Sacramento, CA, USA
16. University of California San Diego Moores Cancer Center , La Jolla, CA, USA
17. Yale Cancer Center , New Haven, CT, USA
18. Public Health Sciences Division, Fred Hutchinson Cancer Research Center , Seattle, WA, USA