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. 2018 Mar 27;14:32. doi: 10.1186/s12992-018-0352-y

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Global Health (GH) as Umbrella Term: The ratio of umbra and penumbra. Legend: the umbrella casts a shadow with an umbra (core shadow) and penumbra. The ratio of umbra and penumbra depends on the distances between light source, umbrella and screen. a-c Demonstrates this effect by adjusting the umbrella between light source and screen. This can be transferred to GH: a close / narrow definition (a) risks to lose important aspects of the penumbra. While a very broad understanding of GH could lead to arbitrariness and irrelevance