1. Editor’s notebook: a quotation with a life of its own;Proctor,2008
2. Health care spending in the United States and other high-income countries;Papanicolas;JAMA,2018
3. Waste in the U.S. health care system: a conceptual framework;Bentley;Milbank Q,2008
4. Accounting for the cost of US health care: a new look at why Americans spend more;Farrell,2008
5. New England Healthcare Institute, How many more studies will it take? A collection of evidence that our health care system can do better. Boston (MA): NEHI. Available at: https://www.nehi.net/writable/publication_files/file/how_many_more_studies_will_it_take_introduction.pdf, Accessed January 11, 2018.