Date	Event	Description
9 September 2008	Amended	Converted to new review format.
11 August 2006	New citation required and conclusions have changed	For the first update of the review, published Issue 4, 2006, the following changes were made: 1. search updated to December 2005; 2. newly identified studies of Blomfeldt 2005, Roden 2003 and STARS 2005 included; 3. Tidermark 2003 moved from ongoing to included; 4. additional 46 cases added to study of Johansson 2000, now renamed Johansson 2002, and an extra reference added; 5. new study, El‐Abed 2005, was excluded; 6. extra references added for Parker 2000, and name changed to Parker 2002; 7. extra references added for Rogmark 2002. In light of the new evidence, some changes were made to the conclusions of the review. For details of previous updates see 'Published Notes'.