1. Utilization of radiology services in the United States: levels and trends in modalities, regions, and populations;Bhargavan;Radiology,2005
2. Table 2B-4: use of physician services per fee-for-service beneficiary continues to increase;Medicare Payment Advisory Commission,2008
3. StrategyOne. American College of Radiology 6 month follow up to post-advertising survey wave 3. Presented at AUR Meeting, Seattle, WA, March 2008.