Date	Event	Description
24 July 2008	Amended	Converted to new review format.
31 October 2006	New citation required and conclusions have changed	The main changes for the fourth update of this review, published Issue 1, 2007, were as follows. 1. Date of search for trials was extended to January 2006. 2. Three studies were newly included (Binder 2004; Tsauo 2005; Mangione 2005), one of which was previously waiting assessment (Mangione 2005, formerly Mangione 2001) and one was previously an ongoing study (Binder 2004, formerly Binder 2001). All three trials took place after hospital discharge. 3. A study which was previously ongoing (Crotty 2003) has become Miller 2006 and is awaiting assessment. 4. One study (Braid 2001) previously listed as ongoing is now excluded. 5. Two newly identified studies were excluded (Licciardone 2004; Shyu 2005). 6. Adjustments were made to text and tables to conform to revised methodology and the Cochrane Style Guide. 7. The conclusions of the review were revised to accommodate the new studies. 8. Authorship of the review has changed. For details of previous updates, please see 'Notes'.