- Correspondence to Dr D J Werring, National Hospital for Neurology and Neurosurgery, Box 6, Queen Square, London WC1N 3BG, UK;
- Received August 30, 2011
- Accepted October 2, 2011
- First published November 5, 2011.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.