Date	Event	Description
1 April 2020	New citation required but conclusions have not changed	A new co‐author (CS) has joined the review and the previous co‐author (CO) has stepped down. Despite the addition of one new study to this review, our conclusions remain the same.
1 April 2020	New search has been performed	A search of the Cochrane Cystic Fibrosis and Genetic Disorders Cystic Fibrosis Trials Register identified five new references which were potentially eligible for inclusion in the review. One reference was the full paper to an abstract previously listed awaiting classification and included at this update (Hanssens 2016). Two were references to a single new study that was excluded (O'Connor 2016). Two were single references to two further new studies that were also excluded (Pastor 2019; Vericel 2019). A study previously listed as awaiting assessment has been excluded (O'Sullivan 2011). A summary of findings table has been added to the review.