1. Persons with chronic conditions: their prevalence and costs;Hoffman;JAMA,1996
2. Burden of disease: implications for future research;Michaud;JAMA,2001
3. Committee on Quality Health Care in America. Institute of Medicine Crossing the quality chasm: a new health system for the 21st century. National Academy Press, Washington, DC, 2001.
4. How good is the quality of health care in the United States?;Schuster;Milbank Q,1998
5. Improving Chronic Illness Care, Robert Wood Johnson Foundation. Seattle, WA, MacColl Institute for Healthcare Innovation, Group Health Cooperative Center for Health Studies (accessed 20 April 2004. at http://improvingchroniccare.org).