1. Health benefits in 2006: premium increases moderate, enrollment in consumer-directed health plans remains modest;Claxton;Health Aff (Millwood),2006
2. Incentive formularies and changes in prescription drug spending;Landon;Am J Manag Care,2007
3. Centers for Medicare & Medicaid Services. Medicare modernization update: Overview: US Dept. of Health & Human Services; 2005. URL: http://www.cms.hhs.gov/MMAUpdate/01_Overview.asp.
4. Q1Group LLC. How does the 2008 Part D model plan compare to 2007 and 2006? 2008. URL: http://www.medicare-partd.com/PartD-The-2008-Medicare-Part-D-Outlook.php?source=google&gclid=CKmf1-m5_pMCFSQdagod8SZAXA#M6175F3C3673D41FFB378D70240FD07DB.
5. Trends in out-of-pocket medical care expenditures for Medicare-age adults with arthritis between 1998 and 2004;Lurie;Arthritis Rheum,2008