Date	Event	Description
3 August 2011	New search has been performed	Five studies previously awaiting classification have now been evaluated: three new studies have been included (Jongkolsiri 2009; Sharma 2005; Shravage 2007) and two have been excluded (Gulati 2001; Navaneethakrishnan 2007). Search updated further on 3 August 2011 and one new report added to Studies awaiting classification for assessment and inclusion in the next update. On further scrutiny, the authors decided that two previously included studies (Giacalone 2000; Razmkhah 1999) do not meet the criteria for inclusion and have therefore excluded them from this update ‐ seeDifferences between protocol and review and Characteristics of excluded studies. The conclusions have not changed. A new (additional) reference was added to the background (Farrar 2011).
3 August 2011	New citation required but conclusions have not changed	Two new authors helped to prepare this update.