Date	Event	Description
31 December 2011	New search has been performed	Search updated. One new trial identified (Zaman 2008) and included. Trial reports previously awaiting classification, have now been incorporated into the review as two new included studies (Lopes 2009; Obaro 2004) and one ongoing study (Dunbar 2007). One study, previously classified as excluded (Quiambao 2003) has now been included. This updated review is now comprised of seven included studies, two excluded studies and one ongoing study.
31 December 2011	New citation required but conclusions have not changed	For this update we have added two new included studies. The overall results and conclusions have not changed.
31 December 2011	New search has been performed	Updated search, adding two included studies.
6 July 2011	Amended	Search updated. Eight reports added to Studies awaiting classification (Deubzer 2004; Dunbar 2007a; Henkle 2010; Holmlund 2011; Lopes 2009a; Obaro 2004a; Quiambao 2007; Steinhoff 2010).
8 May 2008	Amended	Converted to new review format.