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Contributors PW and SB contributed equally to the creation of this manuscript. PW created the first draft of the manuscript and SB made substantial edits. Both authors approve the final manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Disclaimer This review is an abridged version of a Cochrane Review previously published in the Cochrane Database of Systematic Reviews 2018, Issue 8, DOI: /10.1002/14651858.CD007260.pub4 (see www.cochranelibrary.com for information). Cochrane Reviews are regularly updated as new evidence emerges and in response to feedback, and Cochrane Database of Systematic Reviews should be consulted for the most recent version of the review.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Commissioned; internally peer reviewed.
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