1. American Lung Association (ALA), 2006. Indoor Air Pollution Fact Sheet, 〈http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E&b=33347〉.
2. Asthma Initiative of Michigan (AIM), 2006. Indoor Air Pollution Fact Sheet, 〈www.getasthmahelp.org/indoorairquality.asp〉.
3. Current Trends Comorbidity of Chronic Conditions and Disability Among Older Persons-United States, 1984;Centers for Disease Control and Prevention (CDC);Morbidity Mortality Weekly,1989
4. Department of Health and Human Services (HHS), 2000. Healthy People 2010: Understanding and Improving Health. 2nd ed. Washington, DC.
5. Early origins of health disparities: burden of infection, health, and socioeconomic status in US children;Dowd;Social Sci. Med.,2009