Date	Event	Description
6 September 2017	New citation required and conclusions have changed	Nine new trials with 2051 participants were added to the 896 (16 trials) in the previous version of the review. We re‐ordered the comparisons to reflect current asthma management. The evidence has been strengthened by the addition of several large well‐conducted trials. We are more confident that the treatment is likely to be well tolerated; however, there remains uncertainty about modest benefits for lung function and hospital admission when added to standard therapies.
6 September 2017	New search has been performed	New literature search run and incorporated.