1. Chronic care in America: A 21st century challenge,1996
2. Persons with chronic conditions: their prevalence and costs;Hoffman;JAMA,1997
3. Medicare beneficiary demographics. Available at: http://www.medpac.gov/publications/congressional_reports/Jun04DataBookSec1.pdf. Accessed June 25, 2006.
4. The 2004 annual report of the board of the trustees of the federal old-age survivors insurance and disability insurance trust funds. Available at: http://www.ssa.gov/OACT/TR/TR04/trTOC.html. Accessed June 25, 2006.
5. Increased use of colorectal cancer tests in the US;MMWR,2006