1. Department of Epidemiology; University of Michigan; Ann Arbor Michigan
2. Department of Public Health; Erasmus University Medical Center; Rotterdam the Netherlands
3. Institute for Technology Assessment; Massachusetts General Hospital; Boston Massachusetts
4. Department of Radiology; Harvard Medical School; Boston Massachusetts
5. Department of Radiology; Stanford University; Stanford California
6. Department of Radiology, Geisel School of Medicine at Dartmouth; Dartmouth College; Hanover New Hampshire
7. Department of Community Health Sciences; Brock University; St. Catharines Ontario Canada
8. Program in Biostatistics and Biomathematics, Public Health Sciences Division; Fred Hutchinson Cancer Research Center; Seattle Washington
9. Department of Biostatistics; Erasmus University Medical Center; Rotterdam the Netherlands
10. Division of Cancer Prevention; National Cancer Institute; Bethesda Maryland
11. Division of Cancer Control and Population Sciences; National Cancer Institute; Bethesda Maryland