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Bonn: BpB, Bundeszentrale für Politische Bildung, 2014
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[S.l.]: SSRN, 2022
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BMJ, 2017
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BMJ, 2016
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Public Library of Science (PLoS), 2015
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Springer Science and Business Media LLC, 2016
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SAGE Publications, 2014
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British Medical Journal Publishing Group, 2014
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British Medical Journal Publishing Group, 2014
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British Medical Journal Publishing Group, 2014
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British Medical Journal Publishing Group, 2014
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BMJ Publishing Group, 2013
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Springer Science and Business Media LLC, 2011
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SAGE Publications, 2009
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Elsevier BV, 2008
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BMJ, 2007
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BMJ, 2007
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Elsevier BV, 2007
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BMJ, 2007
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BMJ, 2007