Date	Event	Description
3 July 2019	New search has been performed	A search of the Cystic Fibrosis and Genetic Disorders Review Group's Cystic Fibrosis Trials Register did not identify any further references which were potentially eligible for inclusion in this review. Additional searches run by the authors were updated. Two studies were found; however, they do not meet the inclusion criteria and have been listed as excluded (Goldenberg 2012; Goldenberg 2018).
3 July 2019	New citation required but conclusions have not changed	No new data have been added to the review, therefore our conclusions remain the same.