1. HealthPartners Institute, Minneapolis, Minnesota, USA
2. Health Care Systems Research Network/National Cancer Institute Cancer Research Network, USA
3. Regions Hospital Cancer Care Center, St. Paul, Minnesota, USA
4. Cancer Center of Western Wisconsin, New Richmond, Wisconsin, USA
5. Hutchinson Institute for Cancer Outcomes Research, Seattle, Washington, USA
6. Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
7. University of Washington School of Medicine, Seattle, Washington, USA