The editorial group responsible for this previously published document have withdrawn it from publication.
Reason for withdrawal from publication
This review has been withdrawn as the original review author team are unable to update the review. We hope to reallocate to another review author team in the near future.
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|11 March 2014||Amended||Review withdrawn for reasons given in the Published notes section.|
Protocol first published: Issue 2, 2007
Review first published: Issue 3, 2009
|23 May 2008||Amended||Converted to new review format.|
Sources of support
Department of Neurology, West China Hospital, China.
Chinese Cochrane Center, China.
No sources of support supplied