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Author notes

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These article abstracts were originally published in English. These translations have not been verified and should not be relied upon—they are provided for reference purposes only. The Publishers, Editors and the London School of Hygiene and Tropical Medicine have not checked these translations and accept no liability for completeness or accuracy of each translation or the use of them for whatever purpose. These translations may be incomplete and inaccurate in whole or in part. If you need to rely upon a translation of any abstract, a professional human translator should be engaged to supply an accurate translation of the original English. When referencing articles from this journal, please always refer to the original English version, rather than a translated equivalent.