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Düsseldorf: Verbraucherzentrale NRW, 2013
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Berlin: Stiftung Warentest, 2013
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Berlin: Stiftung Warentest, 2009
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Berlin: Stiftung Warentest [u.a.], 2006
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Dessau-Roßlau: Umweltbundesamt, Juni 2024
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Public Library of Science (PLoS), 2016
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Ovid Technologies (Wolters Kluwer Health), 2016
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Ovid Technologies (Wolters Kluwer Health), 2015
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American Medical Association (AMA), 2014
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British Medical Journal Publishing Group, 2014
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BMJ, 2014
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Springer Science and Business Media LLC, 2009