[1] Department of Medicine, Lombardi Cancer Center, Georgetown Univ. School of Medicine, Washington, DC
[2] Depts. Prev. Med. and Indust. Eng., University of Wisconsin-Madison
[3] Dept. of Hlth. Policy and Management, Harvard School of Public Health, Boston, MA
[4] Department of Medicine, Harvard Medical School, Boston, MA
[5] Inst. Hlth., Hlth. Care Plcy., A., Department of Economics, Rutgers University, New Brunswick, NJ
[6] Community Health and Social Medicine, City University of New York, Medical School, NY
[7] Off. of Dis. Prev. and Hlth. Prom., U.S. Public Health Service, Dept. of Health and Human Services, Washington, DC
[8] Georgetown University, School of Medicine, Lombardi Cancer Ctr., Cancer C., Washington, DC 20007