Reason for withdrawal from publication
This protocol for a Cochrane Review has been withdrawn. The editors of Cochrane Heart have concluded that the review's question is no longer of clinical pertinence.
withdrawn
The editorial group responsible for this previously published document have withdrawn it from publication.
History
Protocol first published: Issue 12, 2017
Sources of support
Internal sources
No sources of support provided
External sources
This project was supported by the National Institute for Health Research, via Cochrane Infrastructure to the Heart Group. The views and opinions expressed therein are those of the authors and do not necessarily reflect those of the Systematic Reviews Programme, NIHR, NHS or the Department of Health., UK
Withdrawn from publication for reasons stated in the review