- Correspondence to Dr Mark Edwards, Sobell Department, UCL Institute of Neurology, Queen Square, London WC1N 3BG, UK;
- Received July 26, 2013
- Revised September 11, 2013
- Accepted September 12, 2013
- First published September 27, 2013.
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.