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London [u.a.]: Penguin Books, 1988
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Cambridge [eng.]: Proquest LLC, 1987 ; 2005
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California Digital Library (CDL), 1981
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California Digital Library (CDL), 1981
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Oxford University Press (OUP), 1978
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Wiley, 1978
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California Digital Library (CDL), 1978
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South African Medical Association NPC, 2015
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Wiley, 2013
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JSTOR, 1979
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Hindawi Limited, 2020
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Strategic Journals, 2024
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Springer Science and Business Media LLC, 2023
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Hindawi Limited, 2021
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MDPI AG, 2022
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Elsevier BV, 2018
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Wiley, 2013
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SAGE Publications, 2024
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Cambridge University Press (CUP), 2024
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Ovid Technologies (Wolters Kluwer Health), 2023