Funding for the 18th Annual HMO Research Network Conference was made possible (in part) by 1 R13 CA165520-01 from the National Cancer Institute and the NIH Office of the Director. The views expressed in written conference materials or publications and by speakers and moderators do not necessarily reflect the official policies of the Department of Health and Human Services; nor does mention by trade names, commercial practices, or organizations imply endorsement by the U.S. Government.