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/CD000961/frame.html
The editorial team decided in November 2002 to withdraw this review from publication. It has been replaced with these four reviews:
http://www.mrw.interscience.wiley.com/cochrane/clsysrev/articles/CD004870/frame.html
http://www.mrw.interscience.wiley.com/cochrane/clsysrev/articles/CD004251/frame.html
http://www.mrw.interscience.wiley.com/cochrane/clsysrev/articles/CD004250/frame.html
http://www.mrw.interscience.wiley.com/cochrane/clsysrev/articles/CD006408/frame.html