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Lohmar; Köln: Eul, 2001
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Hindawi Limited, 2006
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Springer Science and Business Media LLC, 2006
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Springer Science and Business Media LLC, 2006
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Public Library of Science (PLoS), 2007
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Elsevier BV, 2008
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Ovid Technologies (Wolters Kluwer Health), 2006
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Ovid Technologies (Wolters Kluwer Health), 2006
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SAGE Publications, 2009
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Elsevier BV, 2007