Institute of Health Research

College of Medicine and Health

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© World Health Organization 2019. Licensee BMJ.
This is an open access article distributed under the terms of the Creative Commons Attribution-Non commercial IGO License (CC BY 3.0 IGO), which permits use, distribution,and reproduction for non-commercial purposes in any medium, provided the original work is properly cited. In any reproduction of this article there should not be any suggestion that WHO or this article endorse any specific organization or products. The use of the WHO logo is not permitted. This notice should be preserved along with the article’s original URL.
Except where otherwise noted, this item's licence is described as © World Health Organization 2019. Licensee BMJ. This is an open access article distributed under the terms of the Creative Commons Attribution-Non commercial IGO License (CC BY 3.0 IGO), which permits use, distribution,and reproduction for non-commercial purposes in any medium, provided the original work is properly cited. In any reproduction of this article there should not be any suggestion that WHO or this article endorse any specific organization or products. The use of the WHO logo is not permitted. This notice should be preserved along with the article’s original URL.