1. The global burden of disease: a comprehensive assessment of mortality and disability from diseases, injuries, and risk factors in 1990 and projected to 2020,1996
2. Persons with chronic conditions. Their prevalence and costs;Hoffman;JAMA,1996
3. Chronic Care in America;Freudenheim,1996
4. Functional status and well-being of patients with chronic conditions. Results from the Medical Outcomes Study;Stewart;JAMA,1989
5. Crossing the Quality Chasm,2001