Authors' contact details may change over time. Occasionally, authors may wish to update their contact details only (i.e. not add or remove authors) in the published Cochrane Review between citation versions, and this can proceed at the discretion of the Managing Editor. If there is a decision to update the contact details in the published Cochrane Review, the Cochrane Review must be republished as an amendment with no new citation; see Assigning What’s New events to Cochrane Reviews. Note that without a new citation version, new contact details will appear only on the review version in the Cochrane Database of Systematic Reviews and not, for example, in PubMed.