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Lengerich: Pabst Science Publ, 2012
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[S.l.]: SSRN, [2020]
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BMJ, 2022
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BMJ, 2019
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BMJ, 2018
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Springer Science and Business Media LLC, 2008
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Springer Science and Business Media LLC, 2008
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Springer Science and Business Media LLC, 2007
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Springer Science and Business Media LLC, 2006
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Springer Science and Business Media LLC, 2005
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Springer Science and Business Media LLC, 2005
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BMJ Publishing Group, 2004
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BMJ, 2004
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Springer Science and Business Media LLC, 2000
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Springer Science and Business Media LLC, 2000
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Springer Science and Business Media LLC, 2000
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Springer Science and Business Media LLC, 2000
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Wiley, 1997
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Springer Science and Business Media LLC, 2008
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Springer Science and Business Media LLC, 2003