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African Journals Online (AJOL), 2021
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Informa UK Limited, 2019
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Elsevier BV, 2017
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Wiley, 2015
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Springer Science and Business Media LLC, 2015
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BMJ, 2012
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Elsevier BV, 2010
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FapUNIFESP (SciELO), 2008
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2008
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Ovid Technologies (Wolters Kluwer Health), 2004
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Ovid Technologies (Wolters Kluwer Health), 2001
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Ovid Technologies (Wolters Kluwer Health), 2000
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Ovid Technologies (Wolters Kluwer Health), 1999
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Ovid Technologies (Wolters Kluwer Health), 1998
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Ovid Technologies (Wolters Kluwer Health), 1998
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Ovid Technologies (Wolters Kluwer Health), 1996
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Ovid Technologies (Wolters Kluwer Health), 1993
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Elsevier BV, 1991
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Elsevier BV, 1991
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Wiley, 1988