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Santa Monica, CA: Rand, 1998
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[Erscheinungsort nicht ermittelbar]: RAND Corporation, 2011
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Santa Monica, CA: RAND Health, 2011
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Durham: Duke University Press, [2005] ; [Online-Ausgabe]
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Massachusetts Medical Society, 2020
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American Board of Family Medicine (ABFM), 2020
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Elsevier BV, 2014
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Ovid Technologies (Wolters Kluwer Health), 2007
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Ovid Technologies (Wolters Kluwer Health), 2003
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Ovid Technologies (Wolters Kluwer Health), 2003
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Ovid Technologies (Wolters Kluwer Health), 2003
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Health Affairs (Project Hope), 2004
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Elsevier BV, 1999
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Elsevier BV, 1998
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Wiley, 1996
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American Medical Association (AMA), 2016
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American Medical Association (AMA), 2016
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American Medical Association (AMA), 2014
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American Medical Association (AMA), 2006
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Health Affairs (Project Hope), 2006