This article is related to a Cochrane Protocol or Review which is published in the Cochrane Database of Systematic Reviews where it will be regularly updated. Cochrane Reviews are of a high standard and are not evaluated by CRD. The link is:
http://www.mrw.interscience.wiley.com/cochrane/clsysrev/articles/CD001156/frame.html
The editorial team has decided to withdraw this review from publication because it has been expanded to include further interventions.