1. Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010
2. The Burden of Musculoskeletal Diseases in the United States.Share of GDP.2014. URL:http://www.boneandjointburden.org/2014-report/xe2/share-gdp#footnote1_jr4bjgk.
3. Agency for Healthcare Research and Quality.Medical Expenditure Panel Survey.2017. URL:https://meps.ahrq.gov/about_meps/Price_Index.shtml.
4. U.S. Bureau of Economic Analysis.Personal Consumption Expenditures: Services: Health Care (DHLCRC1Q027SBEA).2017. URL:https://fred.stlouisfed.org/series/DHLCRC1Q027SBEA.
5. Centers for Medicare and Medicaid Services.National Health Expenditure Accounts: Personal Health Care.2017. URL:https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/NationalHealthExpendData/NationalHealthAccountsHistorical.html.