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Kennedy, Jae; Morgan, Steve. Cost-related prescription nonadherence in the united states and Canada: A system-level comparison using the 2007 international health policy survey in seven countries. Clinical Therapeutics. 2009, 31 (1): 213–219. PMID 19243719. doi:10.1016/j.clinthera.2009.01.006.
Kennedy, Jae; Morgan, Steve. A cross-national study of prescription nonadherence due to cost: Data from the joint Canada-United States survey of health. Clinical Therapeutics. 2006, 28 (8): 1217–1224. PMID 16982299. doi:10.1016/j.clinthera.2006.07.009.
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Brandon Kramer and Michael Shally-Jensen. Prescription Drug costs (页面存档备份,存于互联网档案馆). pp 273-283. in: Encyclopedia of Contemporary American Social Issues 4 volumes, ABC-CLIO, December 22, 2010, Social Science, 1707 pages, Santa Barbara
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