- Correspondence to Professor Peter M Rothwell, Department of Clinical Neurology, Stroke Prevention Research Unit, John Radcliffe Hospital, Level 6, West Wing, Headley Way, Oxford OX3 9DU, UK;
- Received 2 December 2008
- Revised 31 March 2009
- Accepted 8 June 2009
- Published online 25 February 2010.
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