1. Department of Public Health; Erasmus MC; Rotterdam The Netherlands
2. Institute for Technology Assessment; Department of Radiology; Massachusetts General Hospital; Boston MA
3. Center for Colon Cancer Research; University of South Carolina; Columbia SC
4. Bureau of Community Health and Chronic Disease Prevention; South Carolina Department of Health and Environmental Control; Columbia SC
5. Division of Health Policy and Management; School of Public Health; University of Minnesota; Minneapolis MN
6. Department of Epidemiology and Biostatistics; Memorial Sloan-Kettering Cancer Center; New York NY