1. http://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/Chronic Conditions/Downloads/2012Chartbook.pdf
2. http://www.medpac.gov/documents/Mar13_EntireReport.pdf
3. http://www.cms.gov/Regulations-and-Guidance/Guidance/Manuals/Internet-Only-Manuals-IOMs-Items/CMS012673.html
4. http://www.medpac.gov/documents/Mar16_EntireReport.pdf
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