[1] NCI, Div Canc Control & Populat Sci, Bethesda, MD 20892 USA
[2] Maine Med Ctr, Ctr Outcomes Res & Evaluat, Portland, ME 04102 USA
[3] Inst Clin Evaluat Sci, Toronto, ON, Canada
[4] Amer Canc Soc, Intramural Res Dept, Atlanta, GA 30329 USA
[5] Brigham & Womens Hosp, Div Gen Med, Boston, MA 02115 USA
[6] Harvard Univ, Sch Med, Dept Hlth Care Policy, Cambridge, MA 02138 USA
[7] Informat Management Serv Inc, Silver Spring, MD USA
[8] Georgetown Univ, Med Ctr, Canc Control Program, Washington, DC 20057 USA