The editorial group responsible for this previously published document have withdrawn it from publication.
Reason for withdrawal from publication
This review is out of date and has been withdrawn. The content of the review may be of historical interest to readers.
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Last assessed as up-to-date: 18 May 1999.
|22 November 2013||Amended||Review withdrawn, see Published notes.|
Protocol first published: Issue 3, 1999
Review first published: Issue 3, 1999
|28 May 2008||Amended||Plain language summary included|
|28 May 2008||Amended||Converted to new review format.|
Sources of support
Oxford Pain Research funds, UK.
Anglia & Oxford Regional Health Authority, UK.
NHS Research & Development Cancer Programme, UK.
European Union Biomed 2, UK.