Date	Event	Description
11 January 2019	New citation required but conclusions have not changed	Updated. Conclusions unchanged.
16 February 2018	New search has been performed	New searches completed for the third update; no new studies identified.
16 February 2018	Amended	A new co‐author (Declan Patton) has joined Zena Moore, replacing Seamus Cowman who worked on the protocol and the first version of the review. 1. Plain language summary amended to current style format. 2. Information added to the 'Methods' section about 'Summary of findings' tables. 3. Description of studies amended using the headings: 'Population', 'Interventions and comparisons', 'Outcomes'. 4. GRADE 'Summary of findings' tables included and GRADE assessment incorporated into the results. 5. Narrative in 'Quality of the evidence' amended using the headings: 'Limitations in study design and implementation', 'Indirectness of evidence', 'Imprecision of results', 'Publication bias.'