Date	Event	Description
10 November 2014	Amended	Correction: in the updated review published in issue 2, 2014, there was a change to the conclusion for the primary outcome live birth. There was evidence of an increased number of live births with transfer media containing high concentrations of hyaluronic acid.
13 November 2013	New search has been performed	Meta‐analyses on hyaluronic acid have been grouped together. Instead of division into three different comparison groups, now only one group with a subgroup analysis of HA versus low HA and HA versus no HA for the live birth rate and the clinical pregnancy rate. Furthermore, ongoing pregnancy rate has been removed as a secondary outcome measure, and subgroup analyses have been removed from the secondary outcome measures of multiple pregnancy rate and adverse events rate
13 November 2013	New citation required but conclusions have not changed	Two studies added; no change made to conclusions
12 May 2010	Amended	Post‐protocol change: originally implantation rate was not planned for analysis but was to be presented as an additional table. However, we decided to present this outcome measure without pooling.
8 July 2009	Amended	Changed title and authoring team. Changes to protocol: inclusion of all types of adherence compounds, different outcome measures, multiple comparison groups, additional subgroup analyses.