Date	Event	Description
20 July 2016	New search has been performed	A search of the Cochrane Cystic Fibrosis and Genetic Disorders Review Group did not identify any new studies potentially eligible for inclusion in the review. Five additional references to two already excluded studies were identified (Hubert 2009; Riethmueller 2009).
20 July 2016	New citation required but conclusions have not changed	A new author, Tim Gleeson, has joined the review team at this review update and is now lead author. No new data have been added to the review, therefore our conclusions remain the same.