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Any public health guidelines should always be developed from a consistent, clear evidence base
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Contributors ES and UE conceived the idea and agreed on key points. ES: drafted the manuscript. All authors redrafted parts of the manuscript and approved the final version before submission.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.