Reason for withdrawal from publication
This Cochrane review has been withdrawn. The Cochrane review is out of date and included a retracted article in the analysis. Withdrawn by Cochrane Colorectal Group. A new update is expected. The editorial group responsible for this previously published document have withdrawn it from publication.
The editorial group responsible for this previously published document have withdrawn it from publication.
History
Protocol first published: Issue 2, 2010 Review first published: Issue 11, 2011
Withdrawn from publication for reasons stated in the review