- Correspondence to Dr Marina A J de Koning-Tijssen, Movement Disorders, Department of Neurology AB 51, University Medical Centre Groningen (UMCG), PO Box 30.001, 9700 RB Groningen, The Netherlands;
- Received October 17, 2012
- Revised December 27, 2012
- Accepted January 9, 2013
- First published February 16, 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.