Bulletin of the World Health Organization

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The articles in this publication are published by the World Health Organization and contain contributions by individual authors. The articles are available under the Creative Commons Attribution 3.0 IGO licence (CC BY 3.0 IGO) http://creativecommons.org/licenses/by/3.0/igo/legalcode, which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. In any use of these articles, there should be no suggestion that WHO endorses any specific organization, products or services. The use of the WHO logo is not permitted.

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