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Schwalbach/Ts.: Wochenschau-Verl., 1994
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Informa UK Limited, 2000
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The Alan Guttmacher Institute, 1991
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The Alan Guttmacher Institute, 1991
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SAGE Publications, 1988
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Springer Science and Business Media LLC, 1988
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Informa UK Limited, 2010
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SAGE Publications, 1988
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SAGE Publications, 1986
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Informa UK Limited, 2014
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Informa UK Limited, 2011
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JSTOR, 1991
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JSTOR, 1991
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Ovid Technologies (Wolters Kluwer Health), 2022
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Informa UK Limited, 2015
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Informa UK Limited, 2014
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SAGE Publications, 2012
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MDPI AG, 2019
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American Academy of Pediatrics (AAP), 2012
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American Society for Clinical Investigation, 2016