Date	Event	Description
26 January 2015	New search has been performed	A search of the Cystic Fibrosis & Genetic Disorders Group's Trials Registers identified a new reference to an ongoing study which may potentially be eligible for inclusion in the review in the future (NCT01856842).
26 January 2015	New citation required but conclusions have not changed	We did not add any new data to our review and so the conclusions have remained the same.
6 June 2012	New search has been performed	A search of the CFGD Group's registers and MEDLINE did not identify any new references which were potentially eligible for inclusion in this review. One additional reference was added to the list of excluded studies (Liu 2010).
6 June 2012	New citation required but conclusions have not changed	As no new studies have been included, the conclusions of this review have not changed.